Critical Behavior of phi^4-Theory from the Thermal Renormalization Group

Details Critical Behavior of phi^4-Theory from the Thermal Renormalization Group Critical Behavior of phi^4-Theory from the Thermal Renormalization Group

1998-05-28

arxiv.org/abs/hep-ph/9805493v2

Phys.Lett. B437 (1998) 381-389

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version, to appear in Phys. Lett. B; References and discussion added

Scientific paper

10.1016/S0370-2693(98)00900-9

We discuss the universal critical behavior of a selfinteracting scalar field theory at finite temperature as obtained from approximate solutions to nonperturbative renormalization group (RG) equations. We employ a formulation of the RG-equations in real-time formalism which is particularly well suited for a discussion of the thermal behavior of theories which are weakly coupled at T=0. We obtain the equation of state and critical exponents of the theory with a few percent accuracy even for a relatively simple approximation to the exact renormalization group equations.

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