Zeta function regularization of infrared divergences in Bose-Einstein condensation
Zeta function regularization of infrared divergences in Bose-Einstein condensation
The perturbative calculation of the effect of fluctuations in the nonzero frequency modes of a weakly interacting Bose gas on the condensation temperature is reviewed. These dynamic modes, discarded in most of the recent studies, have a temperature-induced energy gap that allows for a perturbative approach. The simple, yet powerful …