标题： 评论 “高温费米子传播子——阻尼率的重求和和规范依赖性” 显示英文标题

标题： Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate''

摘要： Baier等人报告了在高温QED和QCD中，长波长费米子激发的阻尼率即使在Braaten和Pisarski的重求和方案内也依赖于规范选择。显示这个问题是由于费米子自能的壳上展开在红外区域的奇异性引起的。其正则化表明所谓的规范依赖性属于费米子传播子的残留物而非极点，因此特别是阻尼常数是规范无关的，正如应该的那样。 显示英文摘要

摘要： Baier et al. have reported the damping rate of long-wavelength fermionic excitations in high-temperature QED and QCD to be gauge-fixing-dependent even within the resummation scheme due to Braaten and Pisarski. It is shown that this problem is caused by the singular nature of the on-shell expansion of the fermion self-energy in the infra-red. Its regularization reveals that the alleged gauge dependence pertains to the residue rather than the pole of the fermion propagator, so that in particular the damping constant comes out gauge-independent, as it should.