Quantum quench in interacting field theory: A self-consistent approximation

摘要: We study a composite quantum quench of the energy gap and interactions in interacting ${\ensuremath{\phi}}^{4}$ model using self-consistent approximation. First we review results for free theories where or mass leads long times to stationary behavior with thermal characteristics. An exception this rule is $2d$ case zero after quench. In quench, however, find that effect our approximation simply effectively change value mass. This means on one hand also exhibits same other now true even massless case.