Langevin description of gauged scalar fields in a thermal bath
Langevin description of gauged scalar fields in a thermal bath
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温泉浴中测量标量场的 Langevin 描述
DOI：
10.1103/physrevd.89.085037
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发表时间：
2014
影响因子：
5
通讯作者：
and Jun'ichi Yokoyama
中科院分区：
文献类型：
--
作者：
Yuhei Miyamoto;Hayato Motohashi;Teruaki Suyama;and Jun'ichi Yokoyama
研究了热浴中振荡规范标量场的动力学行为。利用实时有限温度有效作用量方法，导出了标量场的Langevin型运动方程，其中包含耗散项和涨落项。证明了非局域耗散项与高斯随机噪声项之间存在量子涨落耗散关系。我们发现，噪声变量在相同的时间是相关的。每一模式的耗散率也进行了研究，这原来取决于波数。
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.