Wilson Renormalization Group formulation of Real Time thermal field theories

Details Wilson Renormalization Group formulation of Real Time thermal field theories Wilson Renormalization Group formulation of Real Time thermal field theories

1996-01-30

arxiv.org/abs/hep-ph/9601375v2

Nucl.Phys. B472 (1996) 711-737

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, latex, 4 ps figures. New evaluation of the RG kernel, comments on the critical limit and new references added. Versi

Scientific paper

10.1016/0550-3213(96)00231-3

We apply Renormalization Group techniques to the Real Time formulation of thermal field theory. Due to the separation between the $T=0$ and the $T\neq 0$ parts of the propagator in this formalism, one can derive exact evolution equations for the Green functions describing the effect of integrating out thermal fluctuations of increasing wavelengths, the initial conditions being the renormalized Green functions of the $T=0$ theory. As a first application, we study the phase transition for the real scalar theory, computing the order of the transition, the critical temperature, and critical exponents, in different approximations to the evolution equations for the scalar potential.

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