Gauge dependence of the fermion quasiparticle poles in hot gauge theories

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/112438

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题名:	Gauge dependence of the fermion quasiparticle poles in hot gauge theories
作者:	Shang-Yung Wang
日期:	2004-09-15
上传时间:	2017-12-19 02:11:11 (UTC+8)
摘要:	The gauge dependence of the complex fermion quasiparticle poles corresponding to soft collective excitations is studied in hot gauge theories at one-loop order and next-to-leading order in the high-temperature expansion, with a view towards going beyond the leading order hard thermal loops and resummations thereof. We find that for collective excitations of momenta k ~ eT the dispersion relations are gauge independent, but the corresponding damping rates are gauge dependent. For k<<eT and in k \to 0 limit, both the dispersion relations and the damping rates are found to be gauge dependent. The gauge dependence of the position of the complex quasiparticle poles signals the need for resummation. Possible cancellation of the leading gauge dependence at two-loop order in the case of QED is briefly discussed.
關聯:	Phys. Rev. D70 (2004) 065011
DOI:	10.1103/PhysRevD.70.065011
显示于类别:	[物理學系暨研究所] 期刊論文

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