Bose-Einstein Condensate: A Superposition of Macroscopically Squeezed States

Details Bose-Einstein Condensate: A Superposition of Macroscopically Squeezed States Bose-Einstein Condensate: A Superposition of Macroscopically Squeezed States

1998-04-21

arxiv.org/abs/cond-mat/9804232v4

Physics

Condensed Matter

4 pages, Latex

Scientific paper

We study the ground state of a uniform Bose gas at zero temperature in the Hartree-Fock-Bogoliubov (HFB) approximation. We find a solution of the HFB equations which obeys the Hugenholtz-Pines theorem. This solution imposes a macroscopic squeezing to the condensed state and as a consequence displays large particle number fluctuations. Particle number conservation is restored by building the appropriate U(1) invariant ground state via the superposition of the squeezed states. The condensed particle number distribution of this new ground state is calculated as well as its fluctuations which present a normal behavior.

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