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arXiv · 1306.2103

On the quantum-field description of many-particle Bose systems with spontaneously broken symmetry

Yu. M. Poluektov
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Abstract

A quantum-field approach to studying the Bose systems at finite temperatures and in states with spontaneously broken symmetry, in particular in a superfluid state, is proposed. A generalized model of a self-consistent field (SCF) for spatially inhomogeneous many-particle Bose systems is used as the initial approximation. A perturbation theory has been developed, and a diagram technique for temperature Green's functions (GFs) has been constructed. The Dyson's equations joining the eigenenergy and vertex functions have been deduced.

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Yu. M. Poluektov. 2013-06-10. On the quantum-field description of many-particle Bose systems with spontaneously broken symmetry. https://arxiv.org/abs/1306.2103

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