Exact CTP Renormalization Group Equation for the Coarse Grained Effective Action

Details Exact CTP Renormalization Group Equation for the Coarse Grained Effective Action Exact CTP Renormalization Group Equation for the Coarse Grained Effective Action

1996-05-03

arxiv.org/abs/hep-th/9605024v2

Phys.Rev. D54 (1996) 6338-6346

Physics

High Energy Physics

High Energy Physics - Theory

RevTeX file, 2 Postscript figures. Final version published in Phys. Rev. D - Equation (23) revised, and minor changes included

Scientific paper

10.1103/PhysRevD.54.6338

We consider a scalar field theory in Minkowski spacetime and define a coarse grained Closed Time Path (CTP) effective action by integrating quantum fluctuations of wavelengths shorter than a critical value. We derive an exact CTP renormalization group equation and solve it using a derivative expansion approach. Explicit calculation is performed for the $\lambda \phi^4$ theory. We discuss the relevance of the CTP average action in the study of non-equilibrium aspects of phase transitions in quantum field theory.

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