Abstract:The BEC regime of a cold fermi gas is characterised by coupled atoms (dimers) which, superficially, look like elementary bosons. We examine how simply-bosonic they really are; firstly, in the Bogoliubov approximation and further, through new actions for the BEC regime in which dimers are represented by coupled Gross-Pitaevskii fields. We find identity at the level of the Bogoliubov approximation in the deep BEC regime, permitting a simple Gross-Pitaevskii description. This fails rapidly as we move towards the … Show more
We reexamine how quantum density uctuations in condensates of ultra-cold Fermi gases lead to uctuations in phonon times-of-ight, an effect that increases as density is reduced. We suggest that these effects should be measurable in pancake-like (two-dimensional) condensates on their release from their con ning optical traps, providing their initial (width/thickness) aspect ratio is suitably large.
We reexamine how quantum density uctuations in condensates of ultra-cold Fermi gases lead to uctuations in phonon times-of-ight, an effect that increases as density is reduced. We suggest that these effects should be measurable in pancake-like (two-dimensional) condensates on their release from their con ning optical traps, providing their initial (width/thickness) aspect ratio is suitably large.
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