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Journal of Low Temperature Physics

Bose-Einstein Condensation and Superfluidity of Strongly Correlated Bose Fluid in a Random Potential

Michikazu Kobayashi, Makoto Tsubota

Published Jan 1, 2005• 1 citation
Publisher
DOI
10.1007/s10909-005-1549-z

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The review is devoted to the elucidation of the basic problems arising in the theoretical investigation of systems with Bose-Einstein condensate. Understanding these challenging problems is necessary for the correct description of Bose-condensed systems. The principal problems considered in the review are as follows: (i) What is the relation between Bose-Einstein condensation and global gauge symmetry breaking? (ii) How to resolve the Hohenberg-Martin dilemma of conserving versus gapless theories? (iii) How to describe Bose-condensed systems in strong spatially random potentials? (iv) Whether thermodynamically anomalous fluctuations in Bose systems are admissible? (v) How to create nonground-statc condensates? Detailed answers to these questions are given in the review. As examples of nonequilibrium condensates, three cases are described: coherent modes, turbulent superfluids, and heterophase fluids.