Analog quantum simulation of gravitational waves in a Bose-Einstein   condensate
  We show how to vary the physical properties of a Bose-Einstein condensate (BEC) in order to mimic an effective gravitational-wave spacetime. In particular, we focus in the simulation of the recently discovered creation of particles by real spacetime distortion in box-type traps. We show that, by modulating the speed of sound in the BEC, the phonons experience the effects of a simulated spacetime ripple with experimentally amenable parameters. These results will inform the experimental programme of gravitational wave astronomy with cold atoms. 
Tupac Bravo, Carlos Sab\'in and Ivette Fuentes
quant-ph cond-mat.quant-gas gr-qc