Universität Potsdam Institut für Physik KarlLiebknechtStr. 24/25 14476 PotsdamGolm 



AbstractWe study the ground state of a uniform Bose gas at zero temperature in the HartreeFockBogoliubov (HFB) approximation. We find a solution of the HFB equations which obeys the HugenholtzPines 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. file generated: 28 Nov 2016


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