Thermodynamic identities and particle number fluctuations in weakly interacting Bose-Einstein condensates
Fabrizio Illuminati, Patrick Navez, Martin Wilkens
We derive exact thermodynamic identities relating the average number of condensed atoms and the root-mean-square fluctuations determined in different statistical ensembles for the weakly interacting Bose gas confined in a box. This is achieved by introducing the concept of auxiliary partition functions for model Hamiltonians that do conserve the total number of particles. Exploiting such thermodynamic identities, we provide the first, completely analytical prediction of the microcanonical particle number fluctuations in the weakly interacting Bose gas. Such fluctuations, as a function of the volume V of the box are found to behave normally, in contrast with the anomalous scaling behaviour V 4/3 of the fluctuations in the ideal Bose gas.
arXiv:cond-mat/9909157•Journal of Physics B Atomic Molecular and Optical Physics•Aug 3, 1999•27 citations