Langevin description of gauged scalar fields in a thermal bath

被引：8

作者：

Miyamoto, Yuhei ^{[1
,2
]}

Motohashi, Hayato ^{[2
,3
]}

Suyama, Teruaki ^{[2
]}

Yokoyama, Jun'ichi ^{[2
,4
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Phys, Tokyo 1130033, Japan

[2] Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe RESCEU, Tokyo 1130033, Japan

[3] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan

[4] Univ Tokyo, WPI, Kavli Inst Phys & Math Universe, TODIAS, Kashiwa, Chiba 2778568, Japan

来源：

PHYSICAL REVIEW D | 2014年 / 89卷 / 08期

关键词：

GRAVITATIONAL-RADIATION; INFLATIONARY UNIVERSE; FLATNESS; HORIZON; WARM;

D O I：

10.1103/PhysRevD.89.085037

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 nonlocal dissipation term and the Gaussian stochastic noise terms is verified. We find that the noise variables are anticorrelated at equal time. The dissipation rate for each mode is also studied, which turns out to depend on the wave number.

引用

页数：13

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