Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-09-11
Phys.Rev. D60 (1999) 065003
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTEX, 33 pages, 2 figures,improved discussion,more examples,same physics to appear in phys. rev. d
Scientific paper
10.1103/PhysRevD.60.065003
We introduce the method of dynamical renormalization group to study relaxation and damping out of equilibrium directly in real time and applied it to the study of infrared divergences in scalar QED. This method allows a consistent resummation of infrared effects associated with the exchange of quasistatic transverse photons and leads to anomalous logarithmic relaxation of the form $e^{-\alpha T t \ln[t/t_0]}$ which prevents a quasiparticle interpretation of charged collective excitations at finite temperature. The hard thermal loop resummation program is incorporated consistently into the dynamical renormalization group yielding a picture of relaxation and damping phenomena in a plasma in real time that trascends the conceptual limitations of the quasiparticle picture and other type of resummation schemes. We derive a simple criterion for establishing the validity of the quasiparticle picture to lowest order.
Boyanovsky Daniel
de Vega Hector J.
Holman Richard
Simionato Michele
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