235 citations · 1.5k across the 23 of their papers we have counts for
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Observer dependence for the phonon content of the sound field living on the effective curved space-time background of a Bose-Einstein condensate
Petr O. Fedichev, Uwe R. Fischer
We demonstrate that the ambiguity of the particle content for quantum fields in a generally curved space-time can be experimentally investigated in an ultracold gas of atoms formin…
Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas
Petr O. Fedichev, Uwe R. Fischer
We propose an experimental scheme to observe the Gibbons-Hawking effect in the acoustic analog of a 1+1-dimensional de Sitter universe, produced in an expanding, cigar-shaped Bose-…
"Cosmological" quasiparticle production in harmonically trapped superfluid gases
Petr O. Fedichev, Uwe R. Fischer
We show that a variety of cosmologically motivated effective quasiparticle space-times can be produced in harmonically trapped superfluid Bose and Fermi gases. We study the analogu…
Zero temperature damping of Bose-Einstein condensate oscillations by vortex-antivortex pair creation
Petr O. Fedichev, Uwe R. Fischer, Alessio Recati
We investigate vortex-antivortex pair creation in a supersonically expanding and contracting quasi-2D Bose-Einstein condensate at zero temperature. For sufficiently large amplitude…