Superfluidity, Bose-Einstein Condensation and Density Fluctuations(Research)

Abstract

We discuss the underlying relation between superfluidity of a Bose-Einstein condenstate and density fluctuations. In this broad context, we focus on the Hess-Fairbank effect, the persistent current, as well as the Josephson effect. We also show our recent results on the instability of superfluidity in a Josephson system.