BEGIN:VCALENDAR VERSION:2.0 PRODID:-//RLASKEY//CALENDEROUS//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT DTSTAMP:20190718T025006Z LAST-MODIFIED:20160226T165841Z DTSTART:20160302T203000Z DTEND:20160302T213000Z URL: SUMMARY:Hidden Sector Dark Matter: The Galactic Center Gamma-Ray Excess and Indirect Detection Constraints DESCRIPTION:Featuring Gilly Elor\, MIT\n\nPart of the HET Seminar Series.\n \nIf dark matter is embedded in a non-trivial hidden sector\, it may annihi late and decay to lighter hidden sector states which subsequently decay to Standard Model particles. While remaining agnostic to the details of the hi dden sector model\, our framework - with annihilations followed by cascadi ng hidden sector decays - captures the generic broadening of the spectrum of secondary particles (photons\, neutrinos\, electron-positrons\, and anti protons) relative to the case of dark matter annihilating directly to Stand ard Model particles. I will detail how such scenarios can explain the appar ent excess in GeV gamma-rays identified in the central Milky Way\, while ev ading bounds from direct detection experiments. Additionally I will describ e how indirect constraints on dark matter annihilation limit the parameter space for such cascade/multi-particle decays. In particular I will describe an investigation of the limits from the cosmic microwave background by Pla nk\, the Fermi measurements of photons from the Milky Way Dwarf Spheroidal Galaxies\, and positron data from AMS-02. Generally the bound from the Ferm i dwarfs is the most constraining for annihilations to photon-rich final st ates\, while AMS-02 is most constraining for electron and muon final states ; however in certain instances the CMB bounds overtake both\, due to their approximate independence of the details of the hidden sector cascade. LOCATION:PRB 595\, 3 Cummington Mall\, 02215 STATUS:CONFIRMED CLASS:PUBLIC END:VEVENT END:VCALENDAR