Path integral representation for spin systens
arXiv:1211.4509
Abstract
The present paper is a short review of different path integral representations of the partition function of quantum spin systems. To begin with, I consider coherent states for SU(2) algebra. Different parameterizations of the coherent states lead to different path integral representations. They all are unified within an U(1) gauge theory of quantum spin systems.
8 pages, in honor of Professor Assene Datzeff; Annuaire de L'Universite de Sofia "St.Kliment Ohridski" Faculte de Physique, Edition Speciale (2012)