Vertex functions and infrared fixed point in Landau gauge SU(N) Yang-Mills theory

被引：150

作者：

Alkofer, R ^{[1
]}

Fischer, CS

Llanes-Estrada, FJ

机构：

[1] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany

[2] Univ Durham, IPPP, Durham DH1 3LE, England

[3] Univ Complutense, Dept Fis Teor 1, E-28040 Madrid, Spain

来源：

PHYSICS LETTERS B | 2005年 / 611卷 / 3-4期

关键词：

confinement; universality; norperturbative QCD; running coupling; Dyson-Schwinger equations; infrared behaviour;

D O I：

10.1016/j.physletb.2005.02.043

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The infrared behaviour of vertex functions in an SU(N) Yang-Mills theory in Landau gauge is investigated employing a skeleton expansion of the Dyson-Schwinger equations. The three- and four-gluon vertices become singular if and only if all external momenta vanish while the dressing of the ghost-gluon vertex remains finite in this limit. The running coupling as extracted from either of these vertex functions possesses an infrared fixed point. In general, diagrams including ghost-loops dominate in the infrared over purely gluonic ones. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：279 / 288

页数：10

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