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arXiv 1010.4802hep-thhep-ph
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Gribov-Zwanziger方程action的非微扰分析

Non-perturbative analysis of the Gribov-Zwanziger action

Markus Q. Huber, Reinhard Alkofer, Silvio P. Sorella

摘要:

在非微扰区域,由于Gribov问题,通常的规范固定是不够的。为了解决这一问题,可以利用Gribov-Zwanziger作用量将路径积分中的积分限制在第一Gribov区域。在它的局部形式中,它具有额外的辅助场,这些辅助场在两点水平上与胶子混合。我们提出了一个明确的红外分析这一行动。我们表明,从两个可能的标度解获得以前只有一个:它完全符合从Faddeev-Popov行动的结果,即,鬼传播子是红外增强的,胶子传播子是红外抑制的,并且相应的幂律行为仅由一个参数kappa=0.5953描述。这证实了Zwanziger的论点,即对于函数方程,考虑适当的边界条件就足够了,并且不需要在路径积分测量中进行明确的限制。

英文摘要:

In the non-perturbative regime the usual gauge fixing is not sufficient due to the Gribov problem. To deal with it one can restrict the integration in the path integral to the first Gribov region by using the Gribov-Zwanziger action. In its local form it features additional auxiliary fields which mix with the gluon at the two-point level. We present an explicit infrared analysis of this action. We show that from the two possible scaling solutions obtained previously only one remains: It coincides exactly with the results from the Faddeev-Popov action, i.e., the ghost propagator is infrared enhanced and the gluon propagator infrared suppressed and the corresponding power law behavior is described by only one parameter kappa=0.5953. This corroborates the argument by Zwanziger that for functional equations it suffices to take into account the appropriate boundary conditions and no explicit restriction in the path integral measure is required.

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