Infrared behavior of gluons and ghosts in ghost-antighost symmetric gauges

被引：35
作者：
Alkofer, R
Fischer, CS
Reinhardt, H
von Smekal, L
机构：
[1] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany
[2] Univ Erlangen Nurnberg, Inst Theoret Phys 3, D-91058 Erlangen, Germany
来源：
PHYSICAL REVIEW D | 2003年 / 68卷 / 04期
关键词：
D O I：
10.1103/PhysRevD.68.045003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
To investigate the possibility of a ghost-antighost condensate, the coupled Dyson-Schwinger equations for the gluon and ghost propagators in Yang-Mills theories are derived in general covariant gauges, including ghost-antighost symmetric gauges. The infrared behavior of these two-point functions is studied in a bare-vertex truncation scheme which has proven to be successful in the Landau gauge. In all linear covariant gauges the same infrared behavior as in the Landau gauge is found: The gluon propagator is infrared-suppressed whereas the ghost propagator is infrared-enhanced. This infrared singular behavior provides an indication against a ghost-antighost condensate. In the ghost-antighost symmetric gauges we find that the infrared behavior of the gluon and ghost propagators cannot be determined when replacing all dressed vertices by bare ones. The question of a BRS invariant dimension-2 condensate remains to be further studied.
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页数：23
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