Anderson-Bogoliubov collective excitations in superfluid Fermi gases at nonzero temperatures
arXiv:1912.03059 · doi:10.1007/s10909-019-02160-3
Abstract
The Anderson-Bogoliubov branch of collective excitations in a condensed Fermi gas is treated using the effective bosonic action of Gaussian pair fluctuations. The spectra of collective excitations are treated for finite temperature and momentum throughout the BCS-BEC crossover. The obtained spectra explain, both qualitatively and quantitatively, recent experimental results on Goldstone modes in atomic Fermi superfluids.
arXiv comment6 pages, 3 figures
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