Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-11-27
J.Phys.A40:6927-6933,2007; J.Phys.A40:6927-6934,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 2 figures; to appear in J. Phys. A; more detailed account of the calculation of the noise and dissipation kernels
Scientific paper
10.1088/1751-8113/40/25/S41
We use nonequilibrium renormalization group (RG) techniques to analyze the thermalization process in quantum field theory, and by extension reheating after inflation. Even if at a high scale $\Lambda$ the theory is described by a non-dissipative $\lambda\phi^{4}$ theory, the RG running induces nontrivial noise and dissipation. For long wavelength, slowly varying field configurations, the noise and dissipation are white and ohmic, respectively. The theory will then tend to thermalize to an effective temperature given by the fluctuation-dissipation theorem.
Calzetta Esteban
Zanella Juan
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