Hawking radiation from sonic black holes in flowing atom condensates.

by Fernando Sols (Universidad Complutense de Madrid)

Friday 20 Mar 2015, 13:00 → 14:30 Europe/Stockholm

Nordita West 122:026 (Nordita West Seminar room)

We study the stationary transport through a double-barrier interface separating regions of asymptotically subsonic and supersonic flow of Bose-condensed atoms. Multiple coherent scattering by the double-barrier gives rise to highly non-thermal Hawking radiation displaying sharp peaks which are mostly associated with decaying resonances and only occasionally with dynamical instabilities. Even at achievable non-zero temperatures, the radiation peaks can be dominated by spontaneous emission [1]. We also investigate the possibility of using the violation of classical Cauchy-Schwarz inequalities by the outgoing radiation beams as a conclusive signature of spontaneous Hawking radiation [2]. We find that the violation can be large in resonant boson structures. Finally, we perform numerical simulations to identify the best protocols to create quasi-stationary black-hole configurations in realistic setups [3]. [1] I. Zapata, M. Albert, R. Parentani, F. Sols. Resonant Hawking radiation in Bose-Einstein condensates. New J. Phys. 13, 063048 (2011). [2] J. R. M. de Nova, F. Sols, I. Zapata. Violation of Cauchy-Schwarz inequalities by spontaneous Hawking radiation in resonant boson structures. Phys. Rev. A 89, 043808 (2014). [3] J. R. M. de Nova, D Guéry-Odelin, F. Sols, I. Zapata. Birth of a quasi-stationary black hole in an outcoupled Bose–Einstein condensate. New J. Phys. 16, 123033 (2014).