1305.6401 (Simone Dresti et al.)

Renormalization of Composite Operators in time-dependent Backgrounds    [PDF]

Simone Dresti, Antonio Riotto

We study the phenomenon of composite operator renormalization and mixing in systems where time-translational invariance is broken and the evolution is out-of-equilibrium. We show that composite operators mix also through non-local memory terms which persist for periods whose duration is set by the mass scales in the problem.

View original: http://arxiv.org/abs/1305.6401