Spectral function at high temperature in the classical approximation

被引：31

作者：

Aarts, G ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

来源：

PHYSICS LETTERS B | 2001年 / 518卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(01)01081-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

At high temperature the infrared modes of a weakly coupled quantum field theory can be treated nonperturbatively in real time using the classical field approximation. We use this to introduce a nonperturbative approach to the calculation of finite-temperature spectral functions, employing the classical KMS condition in real time. The method is illustrated for the one-particle spectral function in a scalar field theory in 2 + I dimensions. The result is compared with resummed two-loop perturbation theory and both the plasmon mass and width are found to agree with the analytical prediction. (C) 2001 Published by Elsevier Science B.V.

引用

页码：315 / 322

页数：8

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