Coherent and squeezed condensates in massless $\lambda \varphi^4$ theory
高能物理 - 理论
2007-05-23 v1
摘要
Generalizing the Bogoliubov model of a weakly non-ideal Bose gas to massless theory we show that spontaneous breaking of symmetry occurs due to condensation in a coherent vacuum % which is energetically favoured compared to the perturbative one. and leads to a vacuum energy density which is lower than that obtained by Coleman and Weinberg using the one-loop effective potential method. We discuss the alternative of a squeezed condensate and find that for the massless theory spontaneous symmetry breaking to a squeezed vacuum does not occur.
引用
@article{arxiv.hep-th/9512193,
title = {Coherent and squeezed condensates in massless $\lambda \varphi^4$ theory},
author = {H. -P. Pavel and D. Blaschke and G. Roepke and V. N. Pervushin},
journal= {arXiv preprint arXiv:hep-th/9512193},
year = {2007}
}
备注
13 pages, Latex