Coherent and squeezed condensates in massless $\lambda {\phi }^4$ theory

H. -P. Pavel, D. Blaschke, G. Roepke +1

Generalizing the Bogoliubov model of a weakly non-ideal Bose gas to massless $\lambda {\phi }^4$ theory we show that spontaneous breaking of symmetry occurs due to condensation in a coherent va…