Coherent and squeezed condensates in massless $λ\varphi^4$ theory

Details Coherent and squeezed condensates in massless $λ\varphi^4$ theory Coherent and squeezed condensates in massless $λ\varphi^4$ theory

1995-12-23

arxiv.org/abs/hep-th/9512193v1

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, Latex

Scientific paper

Generalizing the Bogoliubov model of a weakly non-ideal Bose gas to massless $\lambda\varphi^4$ 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 $\lambda \varphi^4$ theory spontaneous symmetry breaking to a squeezed vacuum does not occur.

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