Critical Behavior of Damping Rate for Plasmon with Finite Momentum in φ^4 Theory

Details Critical Behavior of Damping Rate for Plasmon with Finite Momentum in φ^4 Theory Critical Behavior of Damping Rate for Plasmon with Finite Momentum in φ^4 Theory

2004-02-06

arxiv.org/abs/hep-ph/0402069v2

Phys.Rev. D70 (2004) 037504

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures

Scientific paper

10.1103/PhysRevD.70.037504

Applying thermal renormalization group (TRG) equations to $\phi^4$ theory with spontaneous breaking symmetry, we investigate the critical behavior of the damping rate for the plasmons with finite momentum at the symmetry-restoring phase transition. From the TRG equation the IR cutoff provided by the external momentum leads to that the momentum-dependent coupling constant stops running in the critical region. As the result, the critical slowing down phenomenon reflecting the inherently IR effect doesn't take place at the critical point for the plasmon with finite external momentum.

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