Sigma model effective action for strong localization

Details Sigma model effective action for strong localization Sigma model effective action for strong localization

2008-12-04

arxiv.org/abs/0812.0966v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

17 pages, 1 figure

Scientific paper

Bose gas in a random external field is considered. The sigma model like effective action both for weak and strong random fields compared with the interaction between particles is derived by averaging over the random field and integration over the quantum fluctuations in the framework of the Keldysh-Schwinger technique for irreversible processes. Using this effective action the properties of the system in strongly fluctuating random field are analyzed.

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