Screened perturbation theory

被引：188

作者：

Karsch, F ^{[1
]}

Patkos, A ^{[1
]}

Petreczky, P ^{[1
]}

机构：

[1] EOTVOS LORAND UNIV, DEPT ATOM PHYS, H-1088 BUDAPEST, HUNGARY

来源：

PHYSICS LETTERS B | 1997年 / 401卷 / 1-2期

关键词：

QCD; scalar field theory; free energy density; Debye screening; loop expansion; gap equation; high-T expansion;

D O I：

10.1016/S0370-2693(97)00392-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A new perturbative scheme is proposed for the evaluation of the free energy density of field theories at finite temperature. The screened loop expansion takes into account exactly the phenomenon of screening in thermal propagators. The approach is tested in the N-component scalar field theory at 2-loop level and also at 3-loop in the large-N limit. The perturbative series generated by the screened loop expansion shows much better numerical convergence than previous expansions generated in powers of the quartic coupling. (C) 1997 Elsevier Science B.V.

引用

页码：69 / 73

页数：5

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