Langevin description of gauged scalar fields in a thermal bath
High Energy Physics - Phenomenology
2014-04-30 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We study the dynamics of the oscillating gauged scalar field in a thermal bath. A Langevin type equation of motion of the scalar field, which contains both dissipation and fluctuation terms, is derived by using the real-time finite temperature effective action approach. The existence of the quantum fluctuation-dissipation relation between the non-local dissipation term and the Gaussian stochastic noise terms is verified. We find the noise variables are anti-correlated at equal-time. The dissipation rate for the each mode is also studied, which turns out to depend on the wavenumber.
Keywords
Cite
@article{arxiv.1308.4794,
title = {Langevin description of gauged scalar fields in a thermal bath},
author = {Yuhei Miyamoto and Hayato Motohashi and Teruaki Suyama and Jun'ichi Yokoyama},
journal= {arXiv preprint arXiv:1308.4794},
year = {2014}
}
Comments
23 pages, 4 figures