1306.2103 (Yu. M. Poluektov)

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

Yu. M. Poluektov

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.

View original: http://arxiv.org/abs/1306.2103