Functional integrals for condensed bose systems

Masakazu Ichiyanagi

Physica A: Statistical Mechanics and its Applications, 1979, vol. 98, issue 1, 154-168

Abstract: We express an exact formulation for an interacting Bose system as a functional integration over complex functions. We propose a modification of the generating functional which leads to different limiting processes. The present article rests upon Bogoliubov's description on the explanation of the existence of the order-parameter in terms of quasiaverages arising from a symmetry breaking field. Discussions to determine the order-parameter function are also given. We indicate that the modified functional integral method is relevant to the theory of superfluidity. The derivation of Landau-Ginzburg type equation for the order-parameter is given.

Date: 1979
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:98:y:1979:i:1:p:154-168

DOI: 10.1016/0378-4371(79)90171-7

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