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We propose an experimental scheme to observe the Gibbons-Hawking effect inthe acoustic analog of a 1+1-dimensional de Sitter universe, produced in anexpanding, cigar-shaped Bose-Einstein condensate. It is shown that a two-levelsystem created at the center of the trap, an atomic quantum dot interactingwith phonons, observes a thermal Bose distribution at the de Sittertemperature.Comment: 4 pages, 2 figures, RevTex4; as publishe

Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas