Interaction Effects on Number Fluctuations in a Bose-Einstein Condensate of Light

Authors :: van der Wurff, E. C. I.
de Leeuw, A. -W.
Duine, R. A.
Stoof, H. T. C.
Source :: Phys. Rev. Lett. 113, 135301 (2014)
Publication Year :: 2014
Abstract: We investigate the effect of interactions on condensate-number fluctuations in Bose-Einstein condensates. For a contact interaction we variationally obtain the equilibrium probability distribution for the number of particles in the condensate. To facilitate comparison with experiment, we also calculate the zero-time delay autocorrelation function $g^{(2)}(0)$ for different strengths of the interaction. Finally, we focus on the case of a condensate of photons and discuss possible mechanisms for the interaction.<br />Comment: 13 pages, version 3, 4 figures

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