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42 U.S. Code § 17200 - Reports
(a) Reports on advanced uses of geothermal energy
Not later than 3 years and 5 years after December 19, 2007, the Secretary shall report to the Committee on Science and Technology of the House of Representatives and the Committee on Energy and Natural Resources of the Senate on advanced concepts and technologies to maximize the geothermal resource potential of the United States. The reports shall include—
(1) the use of carbon dioxide as an alternative geofluid with potential carbon sequestration benefits;
(b) Progress reports
(1) Not later than 36 months after December 19, 2007, the Secretary shall submit to the Committee on Science and Technology of the House of Representatives and the Committee on Energy and Natural Resources of the Senate an interim report describing the progress made under this part. At the end of 60 months, the Secretary shall submit to Congress a report on the results of projects undertaken under this part and other such information the Secretary considers appropriate.
Source(Pub. L. 110–140, title VI, § 621,Dec. 19, 2007, 121 Stat. 1684.)
Change of Name
Committee on Science and Technology of House of Representatives changed to Committee on Science, Space, and Technology of House of Representatives by House Resolution No. 5, One Hundred Twelfth Congress, Jan. 5, 2011.
The table below lists the classification updates, since Jan. 3, 2012, for this section. Updates to a broader range of sections may be found at the update page for containing chapter, title, etc.
The most recent Classification Table update that we have noticed was Tuesday, August 13, 2013
An empty table indicates that we see no relevant changes listed in the classification tables. If you suspect that our system may be missing something, please double-check with the Office of the Law Revision Counsel.
|Description of Change
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|Statutes at Large
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At an age when many workers are thinking about winding down their careers, Victoria Baldassano of Silver Spring says she can't afford to give retirement a thought.
The part-time English professor at Montgomery College said her income has been too low for too long to save for retirement, and she's carrying about $40,000 in credit card debt racked up to pay living expenses.
"It's an awkward situation to be in at 61," said Baldassano, who said she thinks more about day-to-day bills than retirement.
Baldassano's predicament is not unusual in Maryland, according to a union-sponsored study on the state's retirement readiness being released Tuesday by an economic think tank.
Maryland households for years have enjoyed the highest median income in the country. But the Schwartz Center for Economic Policy Analysis at the New School in New York found that about four out of 10 households in Maryland headed by someone ages 55 to 64 will have to live almost solely on Social Security in retirement or won't be able to afford to retire at all.
Not counting their home, these older households had less than $100,000 in assets in 2009 — not enough to finance a retirement that could last three decades.
This situation in such an affluent state "just puts an exclamation mark on the end of the sentence that all of America has a coming retirement crisis," said Teresa Ghilarducci, an author of the study and chair of the New School's economics department.
Nationwide, others are even worse off, with almost half of near-retirees expected to be unable to quit work or forced to live almost entirely on Social Security in old age.
But it isn't just older workers in Maryland whose retirements are in jeopardy. The study found that nearly half of Maryland workers — 1.25 million people ages 25 to 64 — do not participate in an employer-sponsored retirement plan, mostly because one isn't available to them.
The Schwartz Center has undertaken similar studies for other states at the request of public officials and others interested in establishing a retirement plan for private-sector workers without access to one at work. The Maryland study was conducted on behalf of the Service Employees International Union, which supports legislation to create such plans here.
A bill that would have done that failed in the House of Delegates this month, but similar legislation has been offered up in the state Senate.
The Schwartz study cited a few factors for the bleak outlook for retirement here: a drop in the number of employer-sponsored retirement plans; a shift away from traditional pensions that pay an income for life; and a lack of participation in retirement plans when workers do have them on the job.
The study reported that between 2000 and 2010, the percentage of Maryland workers who had access to an employer-sponsored retirement plan fell from 67 percent to 59 percent. The 8 percentage point drop is similar to decreases across the country, Ghilarducci said.
The decline coincides with a decrease in large employers, which typically offer more benefits, she said.
In Maryland, the sharpest decline in employees with a workplace plan — 16 percent over a decade — occurred among employers with 500 to 999 employees, the report found.
Workplace plans disappeared fastest in the entertainment and recreation services industry in Maryland, followed by construction.
And among age groups, workers ages 25 to 44 experienced a 13 percent decline in employer-sponsored plans, the largest decrease.
But vanishing workplace plans aren't the only danger to retirements. Workers also are harmed by a shift from traditional pensions to defined contribution plans, such as the 401(k), the report said. With defined contribution plans, the amount of money accrued depends on how much workers and employers contribute and how well investments perform.
Ghilarducci argued that these plans don't work because they are voluntary for both employers and workers.
Even if a company elects to offer a 401(k) and match workers' contributions, employees might not participate, she said. And when they do, they often don't contribute enough.

subset: commoncrawl


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Sprayon® Products Launches the NEW Sprayon.com
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Date: July 11, 2012
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Introducing: Sprayon® SP™704 Heavy Duty Equipment & Surface Deicer
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Date: October 3, 2011
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Introducing: Sprayon® LU™787 Eco-Grade™ Multi-Metal Protectant
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The New Industrial Revolution: The SPRAYON® SYSTEM
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Sprayon® Introduces: Eco-Grade™
Date: May 2010


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Archive for September 18th, 2014
Treo Pro Smartphone, Unlocked – $180 Shipped
The Treo Pro Smartphone, Unlocked has a full QWERTY keyboard, touchscreen, 256MB of built-in storage, WiFi, Windows Media Player, 2 megapixel camera and Windows Mobile 6.1. Dell Small has it for (more…)
Amazon Deals
LG 55LH40 55-Inch 1080p 120Hz LCD HDTV – $1,378 Shipped
Buy.com, via Amazon carries the LG 55LH40 55-Inch 1080p 120Hz LCD HDTV for $1,349.99 + $27.59 S&H = $1,377.58 shipped! This set has a 120hz refresh rate, 1920x1080 resolution, Energy Star compliant 3.0, 4x HDMI inputs, 70,0...
Mitsubishi WD-60C9 60-inch DLP Projection TV – $849 Shipped
The Super Bowl is just around the corner so what better way to enjoy it then with a 60-inch DLP TV from Mitsubishi. This TV has 1920x1080 resolution, 120hz refresh rate, 3x HDMI inputs, built-in HD tuner and 2x 20 watt speaker...
Samsung BD-P1600 Blu-ray Disc Player – $141 Shipped
Crutchfield has the Samsung BD-P1600 Blu-ray Disc Player at a nice price. This Blu-ray player can stream Netflix, Pandora and more, and can upscale DVDs to 1080i. It's (more…)
JVC TH-BA1 Soundbar 4.1-channel Home Theater System – $280 Shipped
Here's a great coupon price for the JVC TH-BA1 Soundbar 4.1-channel Home Theater System. It boasts 4 speakers in 1 (soundbar) and has a 100w wireless subwoofer, magnetic shielding and easy setup. It's (more…)
Amazon Deals
Left 4 Dead 2 For Xbox 360 – $35 Shipped
Amazon has Left 4 Dead 2 For Xbox 360 for $59.99 - $25 instant savings + free shipping = $34.99 shipped! This game is the second installment of the popular first person shooter zombie series. I've played it and its a ton of fu...
Amazon Deals
Samsung PN50B650 50-inch Plasma TV – $1,139 Shipped
Amazon offers the Samsung PN50B650 50-inch Plasma TV for $1,139 + free shipping = $1,139 shipped! This TV has a 1920x1080 full HD picture, 600hz subfield motion, .001 response time, USB input, DLNA compatible and game mode. (mo...
Sony BRAVIA DAV-HDX285 5.1-channel Home Cinema System – $220 Shiped
Newegg had the Sony BRAVIA DAV-HDX285 5.1-channel Home Cinema System for $20 cheaper this past December, but that deal has expired. The specs of this system includes 5 surround speaker, subwoofer, 5-disc DVD changer, FM/AM rad...
Sony STR-DN1000 7.1-channel Receiver – $300 Shipped
Newegg has a coupon deal for the Sony STR-DN1000 7.1-channel Receiver. It has 7 channel surround sound, 110 watts per channel, 30 FM/AM presets, SIRIUS satellite radio, 4x HDMI input, Bravia Sync and more. It's (more…)
Amazon Deals
Canon EOS Rebel T1i Black SLR Digital Camera Kit w/ 18-55mm Lens – $749 Shipped
We've seen the Canon EOS Rebel T1i Black SLR Digital Camera Kit w/ 18-55mm Lens for cheaper, but that deal has expired. Amazon now has it for $749 + free shipping = $749 shipped! This is still a solid price. It includes an 18-...
Amazon Deals
Samsung UN46B8000 46-inch LED TV – $1,795 Shipped
Holy sweet deal! The Samsung UN46B8000 46-inch LED TV has a super high contrast ratio, 1920x1080 resolution, built-in HD tuner, 4x HDMI inputs, 240hz refresh rate, 2x USB inputs, Internet TV via Ethernet connection, 2ms respon...
Amazon Deals
Polk Audio AM1805-A SurroundBar SDA Instant Home Theater – $399 Shipped
Electronics Express, via Amazon has the Polk Audio AM1805-A SurroundBar SDA Instant Home Theater for $399 + free shipping = $399 shipped! This sound bar provides a complete home theater experience without the hassle of setting ...


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New day. New Daily Deals. Get them before they are gone!
New Customer ? Start Here.
Can't find what you're looking for? Shop all ink and toner cartridges by brand
New day. New Daily Deals. Get them before they are gone!
Item: 86185 Model: 18415RED
TMS Camden dining set is made of long lasting natural rubberwood and has 4 red colored chairs along with white finished rectangular table. Scooped seat is designed with slatted back for comfortable sitting posture.
This Web site is intended for use by US residents only. See International Sites. See our delivery policy for full details. Copyright 1998-2014, Staples, Inc., All Rights Reserved.


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Enter your email address and we will send your reference number to this address.
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Your time is precious, that's why you've come to rentalcars.com for your car hire. By working with all the major car hire suppliers we ensure that you only need to make one stop to find the best price for your car hire needs. Our pricing team are constantly working with our suppliers to ensure we've got the best deals available and checking our competitors pricing to make sure we just can't be beat.
In the unlikely event you find someone with a comparable product at a better price we will beat it and offer you a better deal
If you want to take us up on our price watch guarantee fill in the details below and one of our price watch specialists will be in touch with you.
The Price watch guarantee applies to pre-paid rental prices offered on like for like car hires by other independent UK car rental operators using comparable suppliers. It does not apply to vehicles which have an "on-request" status with rentalcars.com or the operator to whom we are being compared. It is valid before or after booking up until the rental start date, and does not apply to promotional offers. rentalcars.com will need to verify the terms and conditions of the alternative offer - once the price, suppliers & T&Cs have been verified a member of our team will contact you with an update on your quote. It is important to note that like for like covers both product and service. For example should the other price be for a rental off airport whereas rentalcars.com's price is on airport this will not be considered like for like. Please note pricewatch requests are handled between 8am and 5pm, Monday to Friday - however requests can be submitted at any time via the pricewatch form on the website.


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Sloggi Control Maxi Briefs (2 Pack)
- In Stock
123 reviews
- Delivery
- Next day delivery available
Sloggi Control Maxi Briefs (2 pack)
Make sure that everything is under control with these easy to wear Sloggi ladies control briefs.
These maxi control briefs feature light control and double layered front panels for a smooth look under clothes. The special comfort waistband and tummy control help you on your way to a smooth and confident silhouette. In comfortable cotton these Sloggi ladies briefs are an everyday favourite.
Wear these maxi control briefs by Sloggi with a Double Comfort bra for maximum comfort.
Useful info:
- Ladies control briefs by Sloggi
- Light control; comfort waistband
- Double layered panels to the front
- Light comfortable cotton fabric


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- Back To School
- Hot Deals
- Guitars
- Bass
- Accessories
- Live Sound
- Keyboards
- Microphones & Wireless
- Recording
- DJ & Lighting
- Drums
- Books/DVDs
- Band/Orchestra
To automatically re-order this item before you run out, select the recurring order option during checkout.
"Beyond Functional Harmony" presents a system that creates melody and harmony and allows them to function outside of the normal dependencies governing the principles of diatonic harmony, melody and form. This system should give the composer a departure point from the harmonic and melodic characteristics grounded in the principles of tonal, key related or functional harmony. This text should be undertaken in the same spirit in which it was written - an excitement of discovery, an enthusiasm for new ideas, and an ongoing pursuit for personal growth and development. Developed at the Berklee College of Music.
|Beyond Functional Harmony


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NEW! Accelerator & Accelerator - concave profile
The new Accelerator is available in both the traditional profile and the new concave profile. Thoughtful design, tremendous machine time and hand finish work let the retro charachter emerge from the massive forging it was born from!
See the new Accelerator - traditional profile
See the new Accelerator - concave profile
Cover-Loc Knock Off Options
The F-10 is the newest addition to the Cover-Loc Series of wheels. Besides the new design itself, the F-10 incorporates a new spindle cap, center nut and cover plate profile that gives it a look you'd might expect to see on a world class super car or hot rod.
Optional 3-Bar Knock Off and Hex Nut Knock Off's are also options for any Cover-Loc wheel., Axiom, Bullet, F-10, G5, Modsport, Velocity, Venom wheels.


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5.11 Tactical® Covert Fleece Jacket
Item # WX2-230267
- Google+
This item is shipped directly from the factory. To see the expected shipping date, please add to your Shopping Cart. Sorry, no express shipping available. We are unable to ship factory direct items to Alaska, Hawaii, Puerto Rico or APO or FPO addresses.
- Details & Specs
5.11 Tactical® Covert Fleece Jacket may look like "civvy" clothes, but it's made for L.E. and security personnel.
Nothing to see here, folks. Just a comfortable, warm, good-looking Fleece Jacket. Inside, though, is 5.11 Tactical®'s patented BBS Back-up Belt System that lets you carry your handgun and necessary documents / identification in stealthy style.Here's the deal:
- 100% polyester fleece is warm, comfortable, wind-resistant
- Hidden chest pockets with 5.11's BBS Back-up Belt System for concealed carry
- Elasticized cuffs and hem seal out the cold
- Zipper handwarmer pockets
- Full zipper front with point collar
- Inside storage pocket. Imported.
State Color and Size, as available in the Shopping Cart. Order ONLINE Today!
- Reviews
Customer ReviewsNo reviews exist for this item....
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Mossi® XT Rain Jacket and BibsBuyer's Club $89.99 Non-Members $99.99
2-Pk. of Guide Gear® Soft Fit Lounge Pants, 1 Red / 1 GreenBuyer's Club $24.99 Non-Members $24.99
Browning® Buckmark Camo Hooded SweatshirtBuyer's Club $22.49 Non-Members $24.99


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Here are the two latest additions to my collection of QSL cards from stations whose callsigns spell words. These two are good enough to eat!
I worked this station during the PA QSO Party. It was as easy as, well you know…….
I worked W6OAT during the CA QSO Party. He was really booming in on 20m phone. You can see why. I bet his neighbors just love having that tower in their neighborhood!


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Narrow your search
If you like word games or puzzles, then Ruzzle is one of the best available. But consider getting the ad-free and more feature-packed premium version.
Pricing not available
We take a look at this unique word-puzzle game available on iOS and now on Android.
A 3D-printed Möbius strip features the first level of Super Mario Bros in an endless loop.
The shots recently displayed at University of California at Riverside are inspiring, considering that most photographers won't know where the camera lens is pointing.
How does it work? Why was it made?
SpellTower is a unique word puzzle game that is well worth its price, especially since it has such high replay value.
Pricing not available
You may have played one or all of these popular games, but for those who haven't, these are the casual games I play on an almost daily basis. As such, I heartily recommend them all.
A 3D printing expert warns that anyone printing their own gun could kill themselves instead.
An Oracle employee is said to have used his corporate AmEx card to run up a rather large sum on two consecutive nights at a San Francisco strip club. The company allegedly refused to honor the expense.
Thought you ruled the roost at Scramble With Friends? Wait until you see some seriously fast fingers redefine the concept of a high score.


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Posts Tagged 'lost luggage'
News Stories
The TrakDot Keeps Tabs on Your Luggage so You Don't Have To
Traveling can be a hassle. Lose your bags and that hassle can become a nightmare. No clean underwear, no toiletries, and no rain coat for those relentless downpours means a trip that will be spent inside your overpriced hotel...


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August 17:
When a person went to check his mail in the 800 block of Alder Street, he saw a person dressed in black running from the area. Extra patrol was provided to the area, but the suspicious person was not located.
Officers received a report from Canada Customs that they were refusing entry to two occupants of a California plated pick-up truck, because they believed the driver of the truck was impaired. This truck was towed back to U.S. Customs, where a Blaine officer contacted the two occupants. It was determined the passenger was not impaired and did have a valid driver�s license. The pair were allowed to leave, with the passenger behind the wheel.
A person in the 1300 block of Boblett Street reported that her purse had been stolen. Within a few minutes of stealing the purse, the suspect started using her credit cards. Her bank was notified and the case is under investigation.
Officers were dispatched to a report of trespassing in the 500 block of 11th Street. During the investigation, an officer found what appeared to be a burglary/malicious mischief which had occurred at a vacant home which the trespassers had entered. Investigation is ongoing at this time.
Officers were dispatched to a report of a person urinating in public in the 300 block of Clark Street. The caller said the man was relieving himself next to his truck, a short distance from her residence. Officers contacted the person who said he was shopping at garage sales and could not wait to get to a restroom. Officers advised the man that charges for lewd act would be sent to the prosecutor for review.
Complainant in the 1500 block of Bayview Avenue reported her daughter stole $500 from her purse and later admitted it. Officer located the daughter who also implicated her brother as helping her take the money. Officer arrested the daughter and son for theft, 2nd degree and recovered all the clothes the kids had purchased with the money. The 13-year-old female and the 16-year-old male were booked into the juvenile detention facility.
Officers received a call of a dispute at a business in the 100 block of SR543. Officers arrived and discovered a good samaritan was refusing to let an intoxicated person get behind the wheel of his vehicle. Following a confrontation with the officers, the subject was placed under arrest for disorderly conduct. The man provided a breath sample and upon seeing the results, agreed with the officers that he had too much to drink to be driving.
A man reported someone unlocked his vehicle in the 300 block of Marine Drive, removed a Browning 22-250 rifle, which was hidden under the driver�s seat, ammunition and an Alpine CD player. The suspect left a crowbar in the car. The incident is under investigation.
Officer received a report of a female transient in the 600 block of Peace Portal Drive who was yelling at people and asking for cigarettes. Officer contacted the female and advised her of the laws against panhandling. She said she understood and would not do it again.
A 17-year-old boy in the 500 block of 12th Street became enraged at his mother for not giving him a larger allowance and punched five holes in the drywall in his bedroom. His parents asked a Blaine officer to document the incident and to forward it to their son�s probation officer.
An apartment manager in the 1600 block of Runge Road observed two non-residents dumping a large quantity of trash into the apartment complex trash bin. The manager confronted the men and recorded the driver�s license number of the vehicle before the man drove off. A Blaine officer traced the license, contacted one suspect and had him recover his trash from the bin. The suspect apologized to the manager and agreed to reimburse the management for the extra pick-up charges from prior incidents of illegal trash dumping.
A resident in the 2200 block of Sea Side Drive reported he was assaulted in his home by two of his wife�s cousins. An officer investigated and contacted the suspects by phone. The suspects came to the police station and admitted punching the victim. The two were arrested and cited to Blaine Municipal Court for assault in the fourth.
A business in the 1700 block of H Street reported an abandoned vehicle on his property that he believed was stolen. RCMP confirmed the vehicle had been stolen from Burnaby, B.C. Vehicle was impounded for safekeeping.
Officers were asked to contact a resident in the 500 block of F Street who was hearing multiple voices in his head and seeing angels and/or devils. The resident was in the care of his mother and was not in any immediate danger. He was referred to his family doctor for treatment.
A business in the 300 block of Peace Portal Drive found an obscene message left on their answering machine. Officers went to the house from which the call may have originated and found it vacant. Investigation continues.
A business in the 600 block of 14th Street called police to report a homeless man who was hiding in some bushes. Officers spoke to the man who was waiting for the bus. He said he would try not to scare anyone while waiting.
The police were dispatched to a residence in the 700 block of A Street in reference to a physical domestic dispute. A 23-year-old male subject was arrested and booked into Whatcom County Jail for assault in the fourth degree.


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Discussion › Forums › discussion › Recommendation – window title
This topic contains 0 voices and has 0 replies.
Hello. I'd like to recommend a change of PN window title. Currently it is "Programmer's Notepad – [filename]". It is better to be "file – [full path] – Programmer's Notepad". Similarly to IE and other software. The idea is to see the name of file in taskbar or task switch box. Currently the user will see the name of program and start of path but not the actual file name.
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Academic Excellence
Northeastern offers a rigorous academic experience tailored to your needs. We think pursuit of excellence happens best in a supportive, individualized environment. The diversity of our faculty and students means that you will benefit from both the understanding that comes from shared cultural backgrounds and the enrichment that comes from a variety of cultures.
- We have 718 faculty with experiences from different countries.
- Our student body is the most diverse in the Midwest.
- Northeastern is a federally designated Hispanic-Serving Institution.
Hands on Learning
The educational experience at Northeastern involves hands-on learning, field research, and community engagement. The academic environment includes opportunities for you to participate in research and present at conferences with faculty. We boast a high student-teacher ratio of 15 to 1. Our faculty are unique scholars who are passionate about teaching.
Student Center for Science Engagement
Arts at Northeastern
McNair Scholars
Civic & Community Engagement
Broad Choices
The range of our academic offerings has broadened considerably since our beginnings in 1867 as Chicago's premier teachers college. Today you can choose from more than 60 undergraduate majors and minors, and 37 master's degrees.
To ensure that all qualified students have access to higher education, we offer an array of evening and weekend classes, and are located at five distinct Chicago campuses. We understand that logistic concerns make a difference for those who are balancing university life, work and home life, and community engagement. We pay special attention to the needs of transfer students. We know that a good college education means more than just knowledge acquisition–mentoring relationships and experiential learning are also crucial.
News & Announcements
Hispanic Heritage Month arrives at Northeastern
3 days agoHispanic Heritage Month kicks off Monday, Sept. 15, at Northeastern Illinois University and runs through Oct. 17. With more than 20 events to choose from,…
Noteworthy at Northeastern: Sept. 12, 2014
6 days agoDid you notice a certain university in the latest U.S. News & World Report college rankings? We sure did! Here is the latest news from…
Ensemble Espanol to participate in Chicago Artists Month
6 days agoEnsemble Espanol Spanish Dance Theater, a company that is in residence at Northeastern Illinois University, will participate in this year's Chicago Artists Month programming with…


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Word of Mouth
John Reuben
John Reuben's first four albums veered wildly between braggadocio and piety. It was an uneasy marriage — the usual hip-hop swagger combined with impassioned calls to Christian service and humility, Reuben's razor-sharp wit and flippant tendencies tempered by his sometimes self-deprecating lyrics. His previous album, 2005's The Boy vs. the Cynic, played the Angelic John vs. Dark John angle to the hilt, with the strident smart-ass duking it out, song by alternating song, with the good Christian evangelist. With Word of Mouth, Reuben has found a way, for the first time in his career, to merge the best of both worlds into a seamless whole, and the resulting album is not only his most mature work to date, but also his most musically adventurous. Produced by Beck compatriot Joe Baldridge, Word of Mouth offers the typically eclectic Beck musical mash-up — banjos colliding with samples from old Delta bluesmen, sappy strings meeting Bootsy Collins bass, surf guitars twanging, children's choirs singing, and Reuben riding herd above it all, his always obvious lyrical gifts honed to a new sharpness and precision. The sarcastic edge that has always characterized Reuben's best songs is well to the fore here. "Make Money" and "Trying Too Hard" satirize hip scenesters everywhere, slyly noting the high price of maintaining the right image along with fashions that are "expensively indie." The title track finds Reuben in uncharacteristically world-weary mode, reflecting on his 15 minutes of fame, wondering if it has already passed him by, and ruminating on the vagaries of an industry where "the next big thing" always sounds remarkably like the last big thing. But if there is a hint of disenchantment at the heart of much of this music, and there is, it would be a mistake to conclude that Reuben is losing much sleep over it. This is a party for thinking men and women, but it's still a party, and the raucous funk of "Good Evening" and "Sing It Like You Mean It" appeals to both the brain and the booty. Still, it's impossible to shake the feeling that this is a new direction for John Reuben. "Cool the Underdog," one of the album's many kiss-offs to adolescence, states it most directly: "The thrill of proving the world wrong is finally gone/You should move on." Word of Mouth is the sound of a precocious brat coming of age, looking disillusionment squarely in the eye, and resolving to lead an extraordinary life in spite of the disappointment. And it's an unqualified triumph. You won't find a truer, more honest, or more celebratory album this year.


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Klaus Haapaniemi is one of the designers making a mix tape for Sister Ray and their Mix Tape Project, where our favorite record store in London — and, well, our hotel — asks designers to pick'em during the London Design Festival. We'll be popping the tape in the lobby's hi-fi, and you can also get your fill in Sister Ray while you stock up. Soon we'll all hear what he hears.
London, Shoreditch
Rainer Judd's life has been famously full of spaces that blur the line between living quarters and studios and galleries. It's part of the reason — when we heard she'd agreed to adorn some of our walls in Shoreditch — we were so excited to have her rarified perspective on place, and the particulars that populate our lives.
Rainer was nice enough to drop us some clues.
I love paper. I'm a journal keeper. I stared when I was 11 and now am on Book no. 37. I love the chronological order that stems from blank pages bound in a book. I don't pull out pages; it's not a loose-leaf binder. It moves forward with time. I depend on it to hold and store my thoughts, ideas, drawings, scraps of imagery, moth wings — whatever I like.
The project was hatched in a London taxi with Alex Calderwood last September when he saw a couple of my drawings. He looked at "Pillow," and with a warm smile said, "I know that feeling exactly… I want these on our walls."
Most of the drawings for Ace were based on ideas from my journals and then, after taking in the space, environment and palette constraints, new imagery was created. Of the sixteen drawings: four are large-scale murals, while others range from portrait to post-it size, tucked away in spots for the viewer to discover.
Drawings range from tender to sassy. They all have stories behind them.
Hashtags invented during the two week London residency:
R.J.'s Thank you Credits: Atelier Ace — Julia Blackburn; At Ace London — Gian Paolo Ilari Levandowski, Carl Pierce, Martin Newbould, Chris Kelly; RJ Studio: Parker Shipp, Vajra Kingsley, Lana Griffin, Dylan Kraus
Photos by Sofie Middernacht and Maarten Alexander
Shoreditch, London
Well, the cat's out of the bag: we've got a couple of new neighbors joining us on High Street. By the end of July, Soho's beloved Sister Ray Records and our dear friends at Opening Ceremony will have a pair of new Shoreditch storefronts — right here at Ace Hotel.
Sister Ray's new vinyl-only outpost opens on July 29, and promises to stock stacks of new and used wax across all genres. They'll be throwing an opening bash once the ribbon's cut — we'll let you know once it shapes up. Meanwhile O.C.'s new, Max Lamb-designed pop-up is set to take over 106 High Street — keeping us company with both men's and women's wares.
"If constellations had been named in the 20th century, I suppose we would see bicycles." — Carl Sagan
We started a proper bike gang in London with tokyobike. Every month we go trolling the Saturday streets around Shoreditch and beyond like some kinda Smiths video — led down cobblestones side streets by our man Duncan Riches, who seems to know a little something special about every corner of the city.
Duncan's got the inside lane on secret spots architectural, historical and otherwise — this month he snuck us into Donna Wilson's creature factory for a behind the scenes pitstop. The three hour spin went by like nothing.
Get jumped into the gang at Ace Hotel London.
Photos courtesy of Yu Fujiwara from tokyobike.
It's been almost four decades since NASA launched their twin Voyager probes — now the farthest manmade objects from Earth, at roughly 12 billion miles from our humble home. The vessels are famously home to a pair of Golden Records — one-sided LPs compiled with the help of Carl Sagan and others as audio time capsules of the human experience — each tossed like beautiful bottled messages into the black sea of space.
Both probes are also home to instruments that transmit electromagnetic signals back to Earth — recording the unique "sounds" emitted from the celestial bodies they pass on their way through the void. Portland's Lefse Records have tapped the well of NASA's recordings, and invited folks like Spiritualized, Beach House and The Antlers to incorporate the otherworldly sounds into a set of new recordings.
On April 15 at 7:30pm, our friends at creative science collective SUPER/COLLIDER present a listening party for THE SPACE PROJECT— the 7" box set coming out on Record Store Day that compiles the cosmic results. The listening party is preceded by a roundtable with The Quietus' Luke Turner, space scientist Professor Andrew Coates, astronomer Dr. Radmila Topolovic and astrostatistician Dr. Daniel Mortlock, discussing the Voyager missions and the lasting effects they've had on our relationship with the stars.
Milano, Italia
Every year during the Salone del Mobile in Milan, Wallpaper* Magazine puts on Handmade — an amazing exhibition of work from the makers and crafters of design, fashion, food and the magical.
For its fifth edition, Wallpaper* invited our Lovage team to set up shop and concoct three exclusive recipes, according to the meticulous techniques they've mastered in their Shoreditch juice and elixir bar at our London outpost. Handmade opened today and our peeps seem to have already adopted the Milanese accent. If you happen to be in Milan this week, come say hello and try some of our Dopo, Calma or Chiaro elixirs.
Handmade x Wallpaper*April 8–12, 10AM–7PMGalleria L'EcletticoVia San Gregorio, 3920124 Milano
Photo via Wallpaper*
From the vast, incomprehensible cartography of the globe to the quiet cognitive maps of the everyday, we map for comfort — to afford ourselves the illusion of place. They're the red dots we use to assure ourselves that "You Are Here" — and that everything else is relative and predictable.
With Where You Are (a must-see website), the pictorially preoccupied storytellers at London publishing house Visual Editions take on the idea of mapping from the perspective of 16 different writers, artists and thinkers — in fiction and non-fiction writing plus a variety of visuals — to create "a book of maps that will leave you feeling completely lost." Featuring contributions from Chloe Aridjis, Alain de Botton, Joe Dunthorne, Leanne Shapton, Geoff Dyer, Olafur Eliasson, Sheila Heti + Ted Mineo, Tao Lin and a host of others, the book is a beautiful, mixed-up marvel of a thing.
The lobby gallery at Ace Hotel London Shoreditch opens up the atlas of Where Are You for the month of April, putting the collection's rich visual components on display twenty-four hours a day. The opening reception is coming up on Wednesday April 2 at 6pm, complete with cocktails, conversation and a few readings.
"As an admirer of people who make things but not being an artist myself, being able to see our products used by artists, architects, illustrators, designers and getting their feedback is very rewarding and a privilege."
In the summer of 2012, our friend Julia opened Choosing Keeping, a specialty shop with all corners dedicated to the desk environment — regardless of whether yours is a place of work or creative escape.
Located on iconic Columbia Road — home of the Sunday Flower Market — Choosing Keeping offers a selection of beautifully-made utility objects, plus carefully-curated books and prints to stimulate the discerning synapses.
Julia's a passionate, adorable shopkeep — the kind that has us making increasingly regular excuses to stop in. We're going to need to find some new pen pals.Choosing Keeping128 Columbia RoadLondon E2 7RG
Nights stay younger longer in Shoreditch lately. We got tired of stepping out for a spot of food just as restaurant staff were stripping back the cutlery, so Hoi Polloi's been celebrating us night creatures with raucous Midnight Suppers.
Thursday nights are set aside for our oft-unruly special guest Maitre D's, with Fridays devoted to Hoi Polloi's musical director — their radiant, Vangelian angel Xavior — who posts up at the piano each week with a new weapon in his arsenal of synthesizers. This round he'll be exploring the outer cosmos with his Arturia Laboratory. If you can't make it on Friday, don't fret: Hoi Polloi will be happy to entertain you late, seven days a week.
London, UK
Throughout the '90s and early '00s, American experimental music treasure William Basinski operated a now-mythical avant-garde incubator beside the East River in North Williamsburg — a studio and performance space that played early host to Diamanda Galás, Antony and countless others. Arcadia closed its doors for good in 2008, but London's Art Assembly brought Basinski out to co-curate a series of Arcadia-inspired music and live art events in London — including a host of pretty spectacular shows at Ace London.
The mini-fest kicked off tonight and continues through March 20. We'll be hosting several shows Downstairs — Basinski and James Elaine's Melancholia film shorts, Julia Kent, Paul Prudence and more — plus Janek Schaefer's sound installation Lay-by-Lullaby will be posted up in the lobby throughout. More details are available at our calendar.


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Life in the Hip Pop Lane...Yeah, That's It
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Cherry Adair
Adult Romance ADAIR
Summary: Even the deepest peril couldn't keep him away from her. As an anti-terrorism operative in T-FLAC's classified paranormal unit, the intrepid, ruggedly handsome Gabriel Edge protects the world from the forces of evil. So when an ingenious and extremely volatile invention is stolen from a covert lab in Arizona, Gabriel zeroes in on the brilliant young scientist who helped to create the device. From Gabriel's first contact, Eden Cahill leaves an indelible impression. Using a mysterious telepathic power as ancient as his Scottish heritage, as well as his seductive physical charms, Gabriel must infiltrate Eden's mind to uncover the secrets she so desperately protects. But Gabriel is in a bind-for the only way to penetrate Eden's memories is through one shared intimate encounter that will trigger revelations, shatter lives, and just might save humanity-all at a terribly steep price.
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Gabriel Edge
An agent for T-FLAC, an elite antiterrorist force; has a Scottish heritage; kidnaps Eden in order to get information about the robot she created; family has been cursed for over 500 years - he will find his lifemate only to watch her die within a few years of being with her; oldest Edge brother.
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Louisville, Ky. (WHAS) – A Louisville woman was arrested Sunday after police responded to a break-in at an abandoned property in the 2200 block of Cedar Street.
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Posts tagged Homestuck Kickstarter
Posts tagged Homestuck Kickstarter
Hey, still-waiting-on-and-wondering-about-my-Kickstarter-rewards guys!
So there have been a lot of emails from you guys (understandably so), and we've had a seriously difficult time getting to them. To the point where we'd have to put 2-3 of our employees on a computer full time just answering them. And that's 2-3 less people sorting, packaging and shipping the Kickstarter packages that remain to be shipped.
While we're still going through these emails, I'm hoping maybe a thorough explanation as to what's going on at What Pumpkin with your Kickstarter goodies will help calm your worries caused by the delays we are experiencing. (On a side note, please include "address change" in the subject line regarding your emails about changing shipping addresses. We REALLY don't want to miss those).
We hope the following information will clear any worries you guys might be having. We know it's been frustrating for all backers still waiting to receive packages and are putting all of our efforts to getting packages out speedily.
The vast majority of backers and What Pumpkin customers have been sweet, understanding and patient… and in generous proportions. We consider ourselves extremely lucky to be working with you, and are wholly thankful for your support in this Kickstarter.
— Amazon Pledges being shipped in the United States —
By far the largest representation of packages we've needed to ship out, we are nearing completion in sending these out. The $505 tier in this category left our offices yesterday and today. The $380 SEER/SLICK/FUN tier is currently being worked on and the last of them should be leaving sometime tomorrow. Or Thursday by the latest if we encounter any hiccups along the way. After these two tiers ship out, we will work on and ship out the remaining six tiers in this Amazon/domestic category, which are:
And as I was writing this, we just decided that we are shipping out $180 SLICK/FUN for this category next. The remaining tiers from the above list should ship out relatively quickly, seeing as they are easier for us to process compared to other tiers. We're guessing by the end of next week.
If you pledged through Amazon, are having your Homestuck swag being mailed to somewhere in the United States, are not in any of the tiers mentioned above, and you haven't gotten a shipping confirmation email or a package, shoot us an email. There might be a problem with your package, and we will be more than happy to remedy it.
— Amazon Pledges being shipped internationally to Canada and elsewhere —
International shipping has presented us with a series of unexpected, head-scratching obstacles throughout this entire process. Our plan from the beginning was to ship everything to you in one large box. This includes the Kickstarter-exclusive print which, when rolled, measures 24 inches long.
The problem? Boxes being shipped via USPS First Class International cannot be longer than 24 inches (outside measurement). The inside measurement would be too small for that print, which we normally store in a protective tube that is at least 26 inches long.
Another problem we are facing is that a handful of backers were either short on the amount of shipping required to ship to their particular area, or didn't add for shipping at all.
But not to worry. We are starting an email campaign shortly where we will contact everyone affected concerning shipping and offer options that will ensure your package gets shipped out in a timely manner.
Now, as far as Canada, we have decided to ship all packages via UPS Standard. This should provide little hassle as UPS doesn't have the same size restrictions that the US Post Office has. Unfortunately, UPS Standard is only a service offered in shipping to Canada. Using UPS to ship these large boxes anywhere else internationally (with even their cheapest shipping service) is still 5-10 times what we would normally be charged, and is thus cost prohibitive.
For packages going internationally (excluding Canada), we will be shipping USPS First Class International. We are currently retooling our packaging process to fix problems regarding size restrictions and should be ready to ship these international packages very soon.
— Pledges placed via PayPal, whether domestic or international —
PayPal pledges have been delayed somewhat as we work to transcribe the survey information filled out by backers in a way that our shipping software can understand. This is crucial with international PayPal shipments, yet still necessary for even domestic PayPal shipments.
While Kickstarter was able to collect all pertinent information regarding backers' selections in their chosen tiers, our PayPal supplemental Kickstarter hosted on www.whatpumpkin.com did not offer us as elegant a solution as on Kickstarter.com.
Backers were limited to choosing too few items when pledging due to limitations with PayPal, so a third-party survey service had to be used to collect all of your selections. And while it worked perfectly, and we've got all your selections, we're still tasked with taking the information received from the surveys and joining it all with purchase and shipping information delivered to us by PayPal.
We are working diligently on that process, and don't expect there to be very much of a lag time between sending out Amazon pledges and PayPal pledges. We will keep you informed, though.
As of this moment, the PayPal pledge packages that have gone out (domestically, and some internationally) are the $55 tier, the $105 GAMEPAK 2 tier, most of the $105 FUNPAK and the $1,000 tier.
We'll keep you updated as things progress via this Tumblr page or our Twitter at www.twitter.com/whatpumpkin.
Thanks guys!
Those people at that web-i-fied What Pumpkin store.
Keep an eye out for some reblogs over the next day or two! We'll be reblogging posts by some excellent freelance artists who we asked to create greeting card images for us. There's so much going on right now with the Kickstarter that the cards aren't our highest priority right now, but we hope they'll be available before the holidays!


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Introduction To Loop Quantum Gravity
by marlon
Tags: loop quantum gravity
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Nov3-11, 09:17 PM
Sci Advisor
PF Gold
First introductory LQG textbook went on sale 1 November 2011.
I checked today to see how it's doing. Earier books have covered related topics: canonical GR, application to cosmology etc. this is first wholly devoted to intro Loop.
A First Course in Loop Quantum Gravity
Rodolfo Gambini, Jorge Pullin
Oxford University Press.
I found several things---one is that you get to browse online. You can look inside the book.
Another is that at least at 7PM Pacific time 3 November it is doing rather well for a textbook:
Amazon Best Sellers Rank: #62,638 in Books
#26 in Books > Professional & Technical > Professional Science > Physics > Mathematical Physics
So it is #26 on the Mathematical Physics bestseller list.
Here's the Oxford Press description:
This book provides an accessible introduction to loop quantum gravity and some of its applications, at a level suitable for undergraduate students and others with only a minimal knowledge of college level physics. In particular it is not assumed that the reader is familiar with general relativity and only minimally familiar with quantum mechanics and Hamiltonian mechanics. Most chapters end with problems that elaborate on the text, and aid learning. Applications such as loop quantum cosmology, black hole entropy and spin foams are briefly covered. The text is ideally suited for an undergraduate course in the senior year of a physics major. It can also be used to introduce undergraduates to general relativity and quantum field theory as part of a 'special topics' type of course.Masters program at Nottingham, including Loop and other QG research
Some papers:
Loop quantum gravity: the first twenty five years
Survey for non-specialists, historical development and indications the theory recovers classical GR.
Lectures on Loop Gravity
Definitive presentation of Loop gravity, with some math prerequisites:
The Big Bang and the Quantum
Loop cosmology, as of mid-2010:
Loop cosmology derives from LQG and this provides the most accessible route to testing. Here are articles mostly by early universe phenomenologists about ways of testing LQC against CMB data,
These articles appeared 2009 or later. As of 3 November there were 45 of them.
Loops 2011 the biannual Loops conference was held in Madrid.
Click on "scientific program" in the menu on the left to see the list of talks. Abstracts and slides pdf of most talks are now available, just click on the title. Videos of the plenary session morning talks are online. There were about 100 parallel session talks.
Research trends, as of 3 November:
http://howlonguntil.net/ day 307
162*365/307 = 193
816*365/307 = 970
LOOP RESEARCH BY YEAR (loop quantum gravity, loop quantum cosmology, spin foam)
2005 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (42 found)
2006 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (77 found)
2007 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (120 found)
2008 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (142 found)
2009 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (145 found)
2010 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (152 found)
2011 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (162 found, annualized 193)
STRING,MEMBRANE,AdS/CFT RESEARCH BY YEAR
(search terms "string model", "membrane model" and "AdS/CFT correspondence")
2005 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (988 found)
2006 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1029 found)
2007 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1050 found)
2008 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1128 found)
2009 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1132 found)
2010 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1046 found)
2011 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (816 found, annualized 970)
Nov13-11, 10:25 PM
Sci Advisor
PF Gold
There is currently a broken link in the Nottingham webpage given in the previous post:
Masters program at Nottingham, including Loop and other QG research
The link to "the Quantum Gravity group" near the bottom of the page should be to:
Francesca has created a world map of places where LQG research is being done or where you can do a PhD in Loop.
It does not have UC Davis but on the whole it is remarkably complete. It's hard to keep such a map up to date.
As confirmation that Carlip is advising LQG research as well as other QG, see:
Nov21-11, 08:22 PM
Sci Advisor
PF Gold
I want to assemble some information and links about the Quantum Geometry/Gravity program at Erlangen. It is getting to be quite a strong program. They have TWO QG groups, one in the Physics department led by Thiemann and now a second group in the Math department led by Meusburger. The intent is to have several postdocs in each, plus PhD students.
Here is about Meusburger:
A postdoc in Meusburger's group is Winston Fairbairn whom we know of as a Rovelli PhD and co-author. There is another postdoc opening. Prof Meusburger recently sent out this email announcement:
A postdoc position will be available in the quantum gravity group within the algebra and geometry group at the Department of Mathematics, University of Erlangen-Nürnberg in Erlangen, Germany...
for more information:
Here is about the quantum gravity group in the Physics Department led by Thiemann:
This group has grown by the addition of some strong people who have had experience with various "new models" approaches. Maïté Dupuis comes there from Lyon, for example.
She has co-authored a lot with Etera Livine, who was her PhD advisor, and also one paper with Freidel.
Enrique Borja, who has co-authored with Etera Livine (several) and Freidel (one)
Emanuele Alesci, a Rovelli PhD and coauthor.
It's also interesting that John Baez' student Derek Wise is there.
αβγδεζηθικλμνξοπρσςτυφχψωΓΔΘΛΞΠΣΦΨΩ∏∑∫∂√±←↓→↑↔~≈≠≡ ≤≥½∞(⇐⇑⇒⇓⇔∴∃ℝℤℕℂ⋅)
Nov22-11, 07:19 PM
Sci Advisor
PF Gold
Here are results of an InSpire search is designed to turn up observational test-related Loop gravity/cosmology papers. In conjunction with LQG/LQC, the DESY search categories are gravitational radiation, inflation, power spectrum, cosmic background radiation, primordial.
Loop pheno papers (increasingly observational test-related)
If we look at the earlier 4-year stretch (2004-2007) using the same categories, we get 27 papers.
Here's the same search for the previous 4 years (2000-2003 inclusive), 6 papers found.
There is a small amount of overlap in the time segments because InSpire counts a paper as having appeared in a certain year, say 2006, if either it was published in professional journal in 2006 or posted as a preprint on arxiv in 2006.
αβγδεζηθικλμνξοπρσςτυφχψωΓΔΘΛΞΠΣΦΨΩ∏∑∫∂√±←↓→↑↔ ~≈≠≡ ≤≥½∞(⇐⇑⇒⇓⇔∴∃ℝℤℕℂ⋅)
Nov25-11, 06:34 PM
Sci Advisor
PF Gold
Research trends, updated as of 25 November:
http://howlonguntil.net/ day 329/365
180*365/329 = 200
855*365/329 = 949
LOOP RESEARCH BY YEAR (loop quantum gravity, loop quantum cosmology, spin foam)
2005 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (42 found)
2006 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (77 found)
2007 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (120 found)
2008 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (142 found)
2009 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (145 found)
2010 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (152 found)
2011 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (200 annualized, from 180 found)
STRING,MEMBRANE,AdS/CFT RESEARCH BY YEAR
(search terms "string model", "membrane model" and "AdS/CFT correspondence")
2005 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (988 found)
2006 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1029 found)
2007 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1050 found)
2008 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1128 found)
2009 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1132 found)
2010 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1046 found)
2011 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (949 annualized, from 855 found)
αβγδεζηθικλμνξοπρσςτυφχψωΓΔΘΛΞΠΣΦΨΩ∏∑∫∂√±←↓→↑↔~≈≠≡ ≤≥½∞⇐⇑⇒⇓⇔∴∃⋅ℝℤℕℂ
Jan29-12, 01:08 AM
Sci Advisor
PF Gold
One way to keep track of current developments in LQG is to watch the ILQGS online seminar list. I've shortened some titles for brevity.
(All seminars will held at 9:00 AM Central Time)
Audio files and slides PDF are made availble online at the ILQGS website.
The site's blog has commentary by other LQG researchers and background notes.
Note that the 2/28 topic is the Freidel Geiller Ziprick paper, currently leading in our MIP poll. The 4/10 talk is on the topic of the current MIP runner-up.
Two of the talks are concerned with triangulation independence, an important issue, and one deals with the classical limit of spinfoam LQG. Pretty much all are topics of current interest.
For convenience I'll gather some potentially useful links:
Here is Rovelli's group at Marseille
Here's the QG bunch at Perimeter
Here is Thiemann's group at Erlangen
Here is Meusburger's group at Erlangen
Here is Dittrich's group at AEI
Here is Oriti's group at AEI
Livine's QG group at Lyon
Pullin's QG group at LSU is part of overall gravity physics, no separate page
Ashtekar's Institute for Gravitation and the Cosmos
see the QG part
By now anyone who follows QG will be familiar with the strong research group at Marseille, so I won't list names there. Perimeter has a lot of well-known people, among the younger researchers: Eugenio Bianchi, Valentin Bonzom, Razvan Gurau, Tim Koslowski, Cecelia Flori, Joseph Ben Geloun. Thiemann's group currently includes Maïté Dupuis, Derek Wise, Emanuele Alesci, Enrique Borja among others. Meusburger's group includes Winston Fairbairn. Dittrich's AEI group incudes Dario Benedetti, Song He, James Ryan, Sebastian Steinhaus (giving the ILQGS presentation this semester), Wojciech Kaminski,...
Oriti's group includes Fotini Markopoulou (as visitor), Matteo Smerlak, Isabeau Premont-Schwarz, Gianluca Calcagni, Lorenzo Sindoni,...
Livine's group at Lyon includes Johannes Tambornino
QG at LSU incudes Jorge Pullin, Parampreet Singh, and Jacobo Diaz-Polo
I should also ennumerate the QG bunch at Penn State. There is a lot to keep track of. Maybe in a later post.
αβγδεζηθικλμνξοπρσςτυφχψωΓΔΘΛΞΠΣΦΨΩ∏∑∫∂√±←↓→↑↔ ~≈≠≡ ≤≥½∞⇐⇑⇒⇓⇔∴∃⋅ℝℤℕℂ
Jan29-12, 01:34 PM
Sci Advisor
PF Gold
To continue the above list:
In the above I should have noted that Kristina Giesel has joined the faculty of Thiemann's group at Erlangen. Also in the above Perimeter QG bunch I should have included Steffen Gielen. This month he moved from AEI (Dittrich group) to Perimeter. http://www.aei.mpg.de/~gielen/
Barrett's QG group at Nottingham
http://www.nottingham.ac.uk/mathemat...m-gravity.aspx (faculty: John Barrett, Kirill Krasnov, Jorma Louko)
More detail on QG at Penn State
(besides many well-known faculty, younger members include Elena Magliaro, Claudio Perini, William Nelson, Adam Henderson, Ivan Agullo---David Sloan until recently of this group is now at Utrecht, Ed Wilson-Ewing has moved on to Marseille, Jon Engle is now faculty at Florida-Atlantic, Param Singh now faculty at LSU)
I shouldn't forget to mention two divisions of the University of Paris: Orsay (Vincent Rivasseau is there) and Paris-Diderot (Marc Geiller). Geiller is giving the February 28 ILQGS talk mentioned in the preceding post, on the Freidel Geiller Ziprick paper.
Hanno Sahlmann has started a QG group at the AsiaPacific CPT (Pohang University of Science and Technology)
Some resource links:
Loops 2011 (many videos and slides pdf of the talks)
Undergrad LQG textbook
A First Course in Loop Quantum Gravity
Rodolfo Gambini, Jorge Pullin
Oxford University Press.
Master's program at Nottingham
Latest review papers
Introduction to Loop Quantum Gravity (Abhay Ashtekar)
Loop Quantum Cosmology: A Status Report (Abhay Ashtekar, Parampreet Singh)
Searches for Loop and String/M papers by year (results for 2011 now appear complete):
LOOP RESEARCH BY YEAR (loop quantum gravity, loop quantum cosmology, spin foam)
2006 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (77 found)
2007 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (120 found)
2008 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (142 found)
2009 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (145 found)
2010 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (152 found)
2011 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb (203 found)
2012 http://inspirebeta.net/search?ln=en&...=25&sc=0&of=hb
STRING,MEMBRANE,AdS/CFT RESEARCH BY YEAR
(search terms "string model", "membrane model" and "AdS/CFT correspondence")
2006 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1029 found)
2007 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1050 found)
2008 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1128 found)
2009 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1133 found)
2010 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (1044 found)
2011 http://inspirebeta.net/search?ln=en&...=10&sc=0&of=hb (928 found)
2012 http://inspirehep.net/search?ln=en&a...=10&sc=0&of=hb
A great series of Perimeter video lectures going back to 2003
select "semester"=all and "year"=all.
Among the more recent are talks by Eugenio Bianchi, Elena Magliaro, Edward Wilson-Ewing, Aristide Baratin, Philipp Höhn, Maïté Dupuis, Muxin Han, Matteo Smerlak
This recent talk by Joseph Ben Geloun was for some reason not catalogued in the QG series
http://pirsa.org/12010132/ so it does not show up in the above search. (topic GFT, tensor field theory)
Feb2-12, 04:23 PM
Sci Advisor
PF Gold
Phenomenology issues affecting various models, which may already be ruled out, are part of the general QG phenomenology picture http://backreaction.blogspot.com/201...time-foam.html that we need to keep track of.
Although the observations discussed here seem not relevant to LQG specifically. In LQG space is not in a simple or naive sense "grainy". Its network states are quantum states of geometry (i.e. refer to relations among geometric measurements)---they're not imagined to be "what space is made of". Lorentz violation such as energydependent speed of light or the blurring of images one might get with a grainy substance are not predictions. One way to say it is QG is not about what space IS but rather it is about HOW IT RESPONDS to measurement. Analogous to basic quantum theory in other areas.
==quote Bee, above link==
...the authors have presented an analysis of the images of 157 high-redshift (z > 4) quasi-stellar objects. They found no blurring. With that, also the holographic foam model is ruled out. Or, to be precise, the parameter α is constrained into a range that is implausible for quantum gravitational effects.
As it is often the case in the phenomenology of quantum gravity, the plausible models are difficult, if not impossible, to constrain by data. And the implausible ones nobody misses when they are ruled out. This is a case of the latter.
Feb2-12, 09:03 PM
I read alot of Three Roads to Quantum Gravity last night. I found a free, legal, online pdf source if anyone wants to check it out too. Kinda for laymen, but it filled in the blanks for me :)
Feb2-12, 11:17 PM
Sci Advisor
PF Gold
Three Roads is certainly one way to get an introduction to QG. Right now I want to focus on the TESTING issue which has surfaced fairly recently. Bee Hossenfelder is a QG phenomenologist and she has just posted a paper written with Leonardo Modesto that discusses a completely new mode of QG testing.
It sounds weird to me and dubious but I respect Bee a lot and maybe I have to get used to it.
It is based on Modesto's 2008 paper that CLAIMS that in LQG a black hole will not have a singularity but will open up out the bottom to make a new spacetime region.
Maybe this could be tested and proved wrong without it showing the whole theory to be wrong.
Maybe it is not an airtight case, maybe he made some special assumption or did not derive it correctly from the full LQG theory.
Anyway it gives an opportunity to test SOMETHING, and Bee is involved. So here is Modesto
s original 2008 paper:
Space-Time Structure of Loop Quantum Black Hole
Leonardo Modesto
In this paper we have improved the semiclassical analysis of loop quantum black hole (LQBH) in the conservative approach of constant polymeric parameter. In particular we have focused our attention on the space-time structure. We have introduced a very simple modification of the spherically symmetric Hamiltonian constraint in its holonomic version...
Emission spectra of self-dual black holes
Sabine Hossenfelder, Leonardo Modesto, Isabeau Prémont-Schwarz
(Submitted on 2 Feb 2012)
We calculate the particle spectra of evaporating self-dual black holes that are potential dark matter candidates. We first estimate the relevant mass and temperature range and find that the masses are below the Planck mass, and the temperature of the black holes is small compared to their mass. In this limit, we then derive the number-density of the primary emission particles, and, by studying the wave-equation of a scalar field in the background metric of the black hole, show that we can use the low energy approximation for the greybody factors. We finally arrive at the expression for the spectrum of secondary particle emission from a dark matter halo constituted of self-dual black holes.
15 pages, 6 figures
I LIKE THIS BECAUSE it is a way to DISPROVE the existence of these weird double-mouthed black holes by looking for, and not finding, their distinctive radiation. It's empirical. And if they actually found some matching radiation it might be quite surprising. So good either way.
Feb4-12, 11:41 PM
Sci Advisor
PF Gold
A good introduction to the topic of LQBH (loop quantum black holes) Modesto-style is
Self-dual Black Holes in LQG: Theory and Phenomenology
Leonardo Modesto, Isabeau Prémont-Schwarz
(Submitted on 20 May 2009)
In this paper we have recalled the semiclassical metric obtained from a classical analysis of the loop quantum black hole (LQBH). We show that the regular Reissner-Nordstrom-like metric is self-dual in the sense of T-duality: the form of the metric obtained in Loop quantum Gravity (LQG) is invariant under the exchange "r ↔ a0/r" where "a0" is proportional to the minimum area in LQG and "r" is the standard Schwarzschild radial coordinate at asymptotic infinity. Of particular interest, the symmetry imposes that if an observer at "r" close to infinity sees a black hole of mass "m" an observer in the other asymptotic infinity beyond the horizon (at "r" close to "0") sees a dual mass "mp/m" ("mp" is the Planck mass). We then show that small LQBH are stable and could be a component of dark matter. Ultra-light LQBHs created shortly after the Big Bang would now have a mass of approximately "10-5 mp" and emit radiation with a typical energy of about 1013 - 1014 eV but they would also emit cosmic rays of much higher energies, albeit few of them. If these small LQBHs form a majority of the dark matter of the Milky Way's Halo, the production rate of ultra-high-energy-cosmic-rays (UHECR) by these ultra light black holes would be compatible with the observed rate of the Auger detector.
18 pages, 32 figures. Extra Plot, Improved Numerical Results
I think the more recent paper I'll call HMP http://arxiv.org/abs/1202.0412
Emission spectra of self-dual black holes refines and corrects some of these estimates. Here is an excerpt
==quote Hossenfelder Modesto Prémont-Schwarz (HMP)==
Integrating the inverse of dM/dt to obtain the lifetime, one finds that the time it takes for the black hole to completely evaporate exceeds the lifetime of the universe for m >~ 10−5mp. The primordially produced black holes with masses of about 10−3mp thus would still not have entirely decayed today. Moreover, they would have an average temperature of T ≈ 10−9mp ≈ 109 TeV, which is about in the energy range of the ultra high energetic cosmic rays (UHECRs) whose origin is still unclear. We thus see why the self-dual black holes can make for an interesting phenomenology. However, to arrive at observational consequences we have to make this rough estimate more precise. For this, we take ...
Mar3-12, 04:56 PM
Sci Advisor
PF Gold
One way to see where a field is going is to check the conferences, what speakers and themes emerge as important. We've done that in the past in this thread. 2011 was a big year for Loop, in terms of research output and conferences, so 2012 is likely to be comparatively quiet. One upcoming event is this June Prague Relativity and Gravitation conference:
Here are excerpts from the invited speaker list.
Abhay Ashtekar (Institute for Gravitation and the Cosmos, Penn State University, University Park )
T.B.A.[my guess is Loop cosmology: inflation, initial conditions at the bounce, power spectrum]
Julian Barbour (Department of Physics, University of Oxford, Oxford)
Prague and the conception of general relativity: Kepler, Mach and Einstein
Karel Kuchař (Department of Physics, University of Utah, Salt Lake City )
Canonical quantum gravity: Einstein's posthumous anathema
Jerzy Lewandowski (Department of Physics, University of Warsaw, Warsaw)
Loop quantum gravity: The status report
Hermann Nicolai (Albert-Einstein-Institut Golm, Potsdam)
Quantum gravity: the view from particle physics
Misao Sasaki (Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto)
Inflation and birth of cosmological perturbations
Bernard Schutz (Albert-Einstein-Institute Golm, Potsdam)
Gravity talks: observing the Universe with gravitational waves
Alexei Starobinsky (Landau Institute for Theoretical Physics, Moscow)
f(R) gravity--the most straightforward generalization of the Einstein gravity
Robert Wald (Enrico Fermi Institute, University of Chicago, Chicago)
Clifford Will (Department of Physics, Washington University, St. Louis)
Testing general relativity: Centenary highlights and future prospects
Ashtekar has new quantum cosmology results with coauthors Agullo and Nelson, that have not been posted yet but were presented in seminar by Nelson
and which will be the subject of an invited presentation by Agullo at the April American Physical Society meeting.
They are important results so it seems possible that Ashtekar will feature the new paper in his Prague talk this June.
This year's Marcel Grossmann meeting (July, in Stockholm) has these relevant parallel sessions:
L. Quantum Gravity
QG1 Loop Quantum Gravity, Quantum Geometry, Spin Foams (Jerzy Lewandowski)
QG2 Quantum Gravity Phenomenology (Giovanni Amelino-Camelia)
QG3 Asymptotic Safeness and Symmetry Breaking in Quantum Gravity (Eckehard W. Mielke)
QG4 Loop quantum gravity: cosmology and black holes (Jorge Pullin, Parampreet Singh)
for more information: http://www.icra.it/mg/mg13/
Jun3-12, 01:52 PM
Sci Advisor
PF Gold
In the previous post I mentioned the Relativity and Gravitation conference scheduled to take place in Prague this month.
at that point the title of Ashtekar's talk was TBA. Now it is listed on the program as:
Abhay Ashtekar (Institute for Gravitation and the Cosmos, Penn State University, University Park )
Loop quantum gravity and the very early universe
I certainly hope that the conference organizers will post PDF slide sets for the talks, online video would be even better. Two other talks could prove especially helpful:
Jerzy Lewandowski (Department of Physics, University of Warsaw, Warsaw)
Loop quantum gravity: The status report
Hermann Nicolai (Albert-Einstein-Institut Golm, Potsdam)
Quantum gravity: the view from particle physics
Back in May a PF member named Neutrino98 asked a basic question. How does Loop gravity work? This post is one possible very basic answer
This occasioned a positive reaction from Tom Stoer, who knows quite a lot about LQG, so I take that as a good sign. Maybe the explanation is worth keeping track of, so I will copy it here and maybe we can fill out some more details---of the simplest possible entry-level account of the theory's basics.
Loop gravity works first of all by focusing attention on geometric MEASUREMENT.
You know that the Einstein 1915 theory of gravity is actually a theory of geometry. How geometry evolves and interacts with matter. How a concentration of matter will cause geometry to curve around it. So gravity = geometry.
Any modern theory of gravity must be a theory of geometry.
What is geometry? It's about measuring things like areas, volumes, angles. And about relations among these measurements, which can change depending on when and what order you measure them. And about predictions concerning future measurements. On a cosmic scale geometry can be about the pattern of expanding distances people call "expanding universe" and all the stuff that goes along with that.
So Loop Gravity works first of all by setting up NETWORKS where each node corresponds to a volume measurement something might make, and the connections between nodes are labeled to indicate the AREA where those chunks of volume might touch. Another word for network is graph: something made up of a bunch of points (nodes) interconnected by lines (links). In this case it's a network of possible measurements and the nodes and links are labeled with volume and area numbers.
A network could have millions of nodes but to picture one of the simplest examples it might just be a square: four nodes at the corners, connected by 4 links which are the sides of the square.
So a network is an idealized STATE of the world's geometry representing the results of a bunch of interrelated measurements which some thing or somebody could be imagined making. (If matter measurements like particle detections are included, that means more labels on the network.)
Then, as a theory of dynamically evolving geometry, LOOP HAS TO SAY HOW THESE NETWORKS, these states of geometry, EVOLVE.
In a quantum theory the PROBABILITY of going from state A to state B is given by a complex number called an AMPLITUDE. So Loop has to say what the amplitude is of going from network state A to network state B.
At the current stage of development of the theory, the tool used to arrive at amplitudes is a kind of path leading from one network to the other. the path looks like a FOAM. To take a simple example, suppose both A and B are squares as described earlier. A path between the two squares could be pictured as a CUBE with A on the bottom or "start" and B on the top or "finish". A hollow cube is all you need to make continuous connection between the two squares. It can even be open on the top and bottom. Such a cube might be one part of a much more elaborate foam.
Loop has a rule for calculating amplitudes from foams. Given a foam that runs from network A (say at the bottom) to network B (say at the top) there is a way to calculate the amplitude of that foam---the probability amplitude of that path of evolution being taken from A to B.
That's the theory. That's how it works.
It gives results like replacing the BigBang "singularity" (where the old theory broke down) by a bounce. The present theory applied to cosmology predicts that a collapsing universe will rebound and undergo a brief very rapid phase of re-expansion. It lets us extrapolate backwards in time to before the start of our own universe's expansion and suggests things to look for as traces of the bounce (as a way of testing.)
The special issue of the journal SIGMA devoted to LQG and LQC now has 19 articles that have gone thru peer review and whose final versions are online. The special issue is still listed as "in progress" so there may be more articles in the pipeline, but I do not know of any. So this may turn out to be the near-final version of the special issue.
A useful cross-section sampling of current research in the Loop Gravity&Cosmology community.
Jun13-12, 01:48 PM
Sci Advisor
PF Gold
More complete information is now available about the lineup of talks at the Prague June conference Relativity and Gravitation http://ae100prg.mff.cuni.cz/program
It's a large conference covering a wide range of topics (observation, numerical work, theory, testing) with talks by major people from many fields. So to get a good idea of the scope you need to look over the whole program. I'll just give some selected excerpts where there is relevance to Loop gravity/cosmology or to provide context. Here's a sample of the program.
MONDAY June 25
Parallel Session
16:00 Jorge Pullin
A local Hamiltonian for spherically symmetric gravity coupled to a scalar field
16:15 Maite Dupuis
Loop Quantum gravity in terms of spinors and harmonic oscillators
16:30 Seth Major
On the Observability of Granularity of Spatial Geometry
16:45 Yuri Bonder
Quantum Gravity Phenomenology without Lorentz Invariance Violations
17:00 Break
17:15 Deborah Konkowski
Quantum singularities in static and conformally static space-times
17:30 Vladimír Balek
From 'nothing' to inflation and back again
17:45 Jakub Mielczarek
Signature change in loop quantum cosmology
18:00 Andrzej Gorlich
A transfer matrix model of volume fluctuations in 4D Causal Dynamical Triangulations
18:15 Igor Khavkine
Time delay observable in classical and quantum geometries
TUESDAY June 26
Plenary Talks in Blue Lecture Hall
8:40 Gary Gibbons
Links between general relativity and other parts of physics
9:20 Abhay Ashtekar
Loop quantum gravity and the very early universe
10:00 Coffee break
10:30 Misao Sasaki
Inflation and birth of cosmological perturbations
11:10 Alexei Starobinsky
f(R) gravity - the most straightforward generalization of the Einstein gravity
WEDNESDAY June 27
Plenary Talks in Blue Lecture Hall
8:40 Bernard Schutz
Gravity talks: observing the Universe with gravitational waves
9:20 Daniel Sudarsky
The quantum gravity interface and the origin of the seeds of cosmic structure during inflation
10:00 Coffee break
10:30 Helmut Friedrich
The large scale Einstein evolution problem
11:10 Hermann Nicolai
Quantum Gravity: the view from particle physics
Parallel Session in Yellow Lecture Hall
16:00 Alejandro Corichi
Effective Dynamics of Anisotropic Cosmologies in Loop Quantum Cosmology
16:15 Steffen Gielen
Spontaneous breaking of Lorentz symmetry for canonical gravity
16:30 Thomas Roman
Probability Distributions of Quantum Stress Tensors in Two and Four Dimensions
16:45 Florian Girelli
Geometric operators in loop quantum gravity with a cosmological constant
FRIDAY June 29
Plenary Talks in Blue Lecture Hall
11:10 Jerzy Lewandowski
Loop Quantum Gravity - where are we?
In early July there will be another large conference, the MG13 (13th Marcel Grossmann) in Stockholm. For Loop and related QG there are several parallel sessions to check out. The chair of each session is supposed to list the lineup of talks in their brief descriptions, but this hasn't happened in all cases yet. I'll give the links to where the listing should appear.
Parallel Session: QG2 - Loop Quantum Gravity, Quantum Geometry, Spin Foams
Parallel Session: QG3 - Asymptotic Safeness and Symmetry Breaking in Quantum Gravity
Parallel Session: CM4 - Quantum Cosmology and Quantum Effects in the Early Universe
Parallel Session: QG4 - Loop quantum gravity: cosmology and black holes
Parallel Session: CM3 - Nonsingular Cosmology
Parallel Session: QG2 - Quantum Gravity Phenomenology
Jun19-12, 08:55 PM
Sci Advisor
PF Gold
The Prague "Relativity and Gravitation" conference starts in about 5 days and the abstracts of all the talks are posted. http://ae100prg.mff.cuni.cz/abstracts Here is a sample of the talks:
Jerzy Lewandowski
Loop Quantum Gravity - where are we?
Abstract: For several models of gravity coupled to other fields, the algorithm of the canonical quantization has been completed and performed to an end. It gave rise to well defined, exact quantum theories. The Dirac observables are provided by the relational and the deparametrization frameworks. The quantum states, Hilbert spaces and concrete quantum operators are furnished by the canonical Loop Quantum Gravity framework. The models are not confirmed experimentally and admit ambiguities, but they are there, available for further study and applications.
Abhay Ashtekar
Loop quantum gravity and the very early universe
Abstract: Since the standard cosmological perturbation theory is based on QFT on curved space-times, it is not applicable in the Planck era. Using techniques from loop quantum gravity, the theory is extended to overcome this limitation. The new framework sharpens conceptual issues by distinguishing between true and apparent trans-Planckian difficulties and shows that the true difficulties can be generically overcome in the standard inflationary scenario, with interesting lessons for both theory and observations. The talk will be based largely on some recently completed joint work with Ivan Agullo and William Nelson.
Hermann Nicolai
Quantum Gravity: the view from particle physics
Abstract: In this talk I will review some facts and lessons that particle physics can offer to help in the search for a fully consistent theory of quantum gravity, including a brief discussion of recent LHC data from this perspective.
Jorge Pullin
A local Hamiltonian for spherically symmetric gravity coupled to a scalar field
Abstract: We present a gauge fixing for gravity coupled to a scalar field in spherical symmetry that leads to a true Hamiltonian that is the integral over space of a local density. We discuss its potential use to study black hole evaporation.
Maite Dupuis
Loop Quantum gravity in terms of spinors and harmonic oscillators
Abstract: Loop Quantum Gravity is an attempt to quantize general relativity. Its kinematical aspects are well understood and yield a description of space in terms of quanta. Spinorial tools provide a really nice geometrical picture of the classical phase space of Loop Gravity. Moving to the quantum level, spinors are simply quantized as harmonic oscillators. They are then the building blocks to define coherent states for Loop Quantum Gravity and to build spinfoam models which is a regularized path integral for general relativity. I will recall the main results of the spinorial formalism in the context of Loop Quantum Gravity and Spinfoam models and explain how it can be generalized to introduce a cosmological constant into the game.
Yuri Bonder
Quantum Gravity Phenomenology without Lorentz Invariance Violations
Abstract: In the last years the phenomenology of quantum gravity has been dominated by the search of violations of Lorentz symmetry. However, there are very serious arguments that led us to assume that Lorentz invariance is a real symmetry in Nature. This motivated us to construct a phenomenological model describing how a Lorentz invariant discrete structure of spacetime could become manifest. The proposal is fully observer covariant, it involves non-trivial couplings of curvature to matter fields and leads to a well defined phenomenology. In fact, an experiment specially designed to test the model has been performed by the Eöt-Wash group allowing to put bounds on some of the model's free parameters.
Jakub Mielczarek
Signature change in loop quantum cosmology
Abstract: The Wick rotation is commonly considered only as an useful computational trick. However, as it was suggested by Hartle and Hawking already in early eighties, Wick rotation may gain physical meaning at the Planck epoch. While such possibility is conceptually interesting, leading to no-boundary proposal, mechanism behind the signature change remains mysterious.
In this talk we show that the signature change anticipated by Hartle and Hawking may occur in result of the loop quantum gravity effects. Theory of cosmological perturbations with the effects of quantum holonomies is constructed. It is shown that such theory can be uniquely formulated in the anomaly-free manner. The algebra of quantum constraints turns out to be modified such that the signature is changing from Lorentzian in low curvature regime to Euclidean in high curvature regime. Implications of this phenomenon on propagation of cosmological perturbations are discussed. Possible relations with other approaches to quantum gravity are also outlined.
Alejandro Corichi
Effective Dynamics of Anisotropic Cosmologies in Loop Quantum Cosmology
Abstract: We present results of numerical evolutions of effective equations for anisotropic cosmologies with spatial curvature in loop quantum cosmology. We address the issue of singularity resolution for different types of initial conditions and study the behavior of geometrical scalar quantities.
Steffen Gielen
Spontaneous breaking of Lorentz symmetry for canonical gravity
Abstract: In Hamiltonian formulations of general relativity, in particular Ashtekar variables which serve as the classical starting point for loop quantum gravity, Lorentz covariance is a subtle issue which has been the focus of some debate, while at the same time being crucial with regard to possible experimental tests. After reviewing the sources of difficulty, we present a Lorentz covariant formulation in which we generalise the notion of a foliation of spacetime usually used in the Hamiltonian formalism to a field of "local observers" which specify a time direction only locally. This field spontaneously breaks the local SO(3,1) symmetry down to a subgroup SO(3), in a way similar to systems in condensed matter and particle physics. The formalism is analogous to that in MacDowell-Mansouri gravity, where SO(4,1) is spontaneously broken to SO(3,1). We show that the apparent breaking of SO(3,1) to SO(3) is not in conflict with Lorentz covariance. We close by outlining other possible applications of the formalism of local observer, especially with regard to phenomenology of quantum gravity.
Florian Girelli
Geometric operators in loop quantum gravity with a cosmological constant
Abstract: Loop quantum gravity is a candidate to describe the quantum gravity regime with zero cosmological constant. One of its key results is that geometric operators, such as area, angle, volume, are quantized. Not much is known when the cosmological constant is not zero. It is usually believed that to introduce this parameter in the game, we need to use quantum groups. However due to the complicated algebraic structure inherent to quantum groups not much is known in this case. Apart from the area operator, the geometric operators are not yet defined. I will discuss how the use of tensor operators can circumvent the difficulties and allow to construct a natural set of observables. In particular, I will construct the natural geometric observables such as angle or volume and discuss some of their properties.
Franz Hinterleitner
Quantization of plane gravitational waves
Abstract: A long-standing problem in Loop Qauntum Gravity (LQG) is the semiclassical limit and the question of Lorentz invariance violation due to the "granularity" of quantum space-time. In full 3+1 LQG there are strong indications for such violations, but no definitve answer to this issue has been given so far.
Unidirectional plane gravitational waves are 1+1 dimensional fully general-relativistic systems, which are convenient for an investigation of possible dispersion of gravitational radiation, quantum fluctuations of flat space, and the speed of light in a quantum space-time environmant.
In a recent paper a classical canonical approach to plane waves was found, where the reduction from arbitrarily forth- and back running waves to unidirectional ones is formulated in terms of first-class constraints. This means that this step of symmetry reduction can be carried out after quantization. The presently ongoing work deals with the formulation of the corresponding quantum constraint operators and the construction of solutions.
More information about the schedule and program of the conference is here:
Jun29-12, 03:22 PM
Sci Advisor
PF Gold
The triennial Marcel Grossmann meeting "MG13" starts next week in Stockholm.
To see the QG-related talks to be given go to:
Scroll down to the QG block
Clicking on QG4 A gives, for example, the first of two sessions chaired by Jorge Pullin, taking place Thursday 5 July and Friday 6 July.
CLICKING ON THE TITLE OF THE TALK links to a brief abstract.
1) 14:00 - 14:30
Rovelli, Carlo
Recent developments in Black Hole physics
2) 14:30 - 15:00
Perez, Alejandro
Black holes in LQG, a local perspective.
3) 15:00 - 15:30
Bianchi, Eugenio
Entropy of Non-Extremal Black Holes from Loop Gravity
4) 15:30 - 16:00
Barbero, Fernando
The thermodynamic limit for black holes in loop quantum gravity.
5) 16:30 - 17:00
Diaz Polo, Jacobo
Testable predictions from loop quantum gravity in evaporating microscopic black holes
6) 17:00 - 17:30
Gambini, Rodolfo
Quantum scalar field in spherical quantum gravity: Standard and nonstandard techniques.
7) 17:30 - 18:00
Pranzetti, Daniele
Dynamical evaporation of quantum horizons
8) 18:00 - 18:30
Frodden, Ernesto
Toward the LQG quantization of rotating black holes
Jun29-12, 03:27 PM
Sci Advisor
PF Gold
See also the previous post #304
The triennial Marcel Grossmann meeting "MG13" starts next week in Stockholm.
To see the QG-related talks to be given go to:
Scroll down to the QG block and click on, for example, QG1A.
This will give the Tuesday 3 July session, the first of two Loop-and-allied sessions chaired by Jerzy Lewandowski. CLICKING ON THE TITLE OF THE TALK links to a brief abstract.
1) 14:00 - 14:30
Rovelli, Carlo
Covariant dynamics
2) 14:30 - 15:00
Lewandowski, Jerzy
Quantizable canonical LQG
3) 15:00 - 15:30
Ma, Yongge
Loop Quantum Scalar-Tensor Gravity and Cosmology
4) 15:30 - 16:00
Bianchi, Eugenio
Horizons in spin foam gravity
COFFEE BREAK (I've added some possibly incomplete place tags to help keep track of the next batch of speakers.)
5) 16:30 - 16:50
Vidotto, Francesca (Mars. Utr.)
Spinfoam Cosmology
6) 16:50 - 17:10
Puchta, Jacek (Wars. Mars.)
Operator Spin-network Diagrams in calculations of higher order amplitudes in dipole cosmology
7) 17:10 - 17:30
Zipfel, Antonia (Erl.)
Solving the Euclidean scalar constraint with Spin Foam methods
8) 17:30 - 17:50
Pawlowski, Tomasz (Wars. Mad. UNB Penn.)
Computable framework of Loop Quantum Gravity
9) 17:50 - 18:10
Alesci, Emanuele (Mars. Erl.)
A new perspective on early cosmology
10) 18:10 - 18:30
Duston, Christopher (FSU-Marcolli)
Topspin Networks and Loop Quantum Gravity
11) 18:30 - 18:50
Smerlak, Matteo (Mars. Perim.)
The shift symmetry in spin foam models of BF theory
12) 18:50 - 19:10
Ryan, James (AEI, Unam)
Tensor models and discrete quantum gravity
Jun29-12, 03:49 PM
Sci Advisor
PF Gold
See also post #304 on the previous page.
I should note that session QG2 A, the first of two chaired by Giovanni Amelino-Camelia, has a talk by Bee Hossenfelder discussing the possibility of FTL exchange of information within the context of quantum gravity. Try clicking on QG2A and check out her abstract.
On the other hand, still in the QG block, clicking on QG4 B
will give Friday 6 July the second of two sessions chaired by Jorge Pullin
Here as on the previous page, the abstract shows up when you click on the talk's title.
1) 14:00 - 14:30
Agullo, Ivan
A quantum gravity extension of the inflationary paradigm
2) 14:30 - 15:00
Wilson-Ewing, Edward
Lattice LQC
3) 15:00 - 15:20
Cailleteau, Thomas
Observational consequences of Loop Quantum Cosmology
4) 15:20 - 15:40
Vidotto, Francesca
Spinfoam for cosmologists
5) 15:40 - 16:00
Dapor, Andrea
Loop Quantum Cosmology for nonminimally coupled Scalar Field
6) 16:30 - 17:00
Pawlowski, Tomasz
Geometric time in quantum cosmology
7) 17:00 - 17:30
Velhinho, Jose
Uniqueness of the Fock quantization of scalar fields with time dependent mass
8) 17:30 - 17:50
Fernández-Méndez, Mikel
Hybrid quantization of an inhomogeneous inflationary scenario
9) 17:50 - 18:10
Martín-de Blas, Daniel
Approximated quantum solutions in inhomogeneous loop quantum cosmology
10) 18:10 - 18:50
Dapor, Andrea
Quantum Field Theory on LQC Bianchi Spacetimes
11) 18:30 - 18:50
Cianfrani, Francesco
Inhomogeneous Universe in Loop Quantum Gravity
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So Much Fun It's Scary! - Only Days Until HALLOWEEN!
Bad Habit Nun Womens CostumeYou'll have everyone reading Bible passages when you wear this Bad Habit Nun adult womens costume. The black and white, habit-inspired dress features a zipper-front closure and comes complete with a wimple-like headpiece and a Holly Hammered Book with flask.
Average Rating: 3.5
(2 Reviews)
Search Suggestions: Nun | Nun Costume | Bad Nun | Bad Habit Nun
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By The Naughty Nun
from Portland, ME
About Me Adventurous
(2 of 2 customer found this review helpful)
Costume worked but "Bible" came smashed!
- Comfortable
- Naughty flirty fun
- Fits Well
- Lots of Fun
- Cute
- Broken "Bible"
- Incomplete
- Costume Party
- Halloween Happy Hour
This costume worked as planned, we had an office party and all of the office mates dressed as clergy people or biblical figures. The only issue I had with it is that the Bible that came with the costume arrived smashed and it wouldn't stay closed.BOTTOM LINE Yes, I would recommend this to a friend
By Txlady
from Houston, Tx
About Me
(1 of 1 customer found this review helpful)
Great Costume
- Authentic Looking
- Cute
- Comfortable
- Fits Well
- Lots of Fun
- A little short
- Costume Party
I really like this costume. The only downside is that it is a little short.I am 5'7 160 lbs. I am going to purchase bloomers tomorrow! This is def nothing to wear to an event where children will be or work functions unless you don't care about everyone seeing your behind.BOTTOM LINE Yes, I would recommend this to a friend