1303.4913 (Yu. M. Poluektov)

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

Yu. M. Poluektov

A quantum-field approach for describing many-particle Fermi systems at finite temperatures and with spontaneously broken symmetry has been proposed. A generalized model of self-consistent field (SCF), which allows one to describe the states eligible for this system with various symmetries, 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 equation for the self-energy and vertex parts has been deduced.

View original: http://arxiv.org/abs/1303.4913