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arXiv 0910.5604hep-th
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朗道规范中考虑Gribov视界的Dyson-Schwinger方程的红外分析

Infrared analysis of Dyson-Schwinger equations taking into account the Gribov horizon in Landau gauge

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

摘要:

利用Dyson-Schwinger方程研究了朗道规范Gribov-Zwanziger作用量的低动量行为。由于胶子和辅助场的混合,红外行为可以区分为四种情况。其中两个导致不一致,可以丢弃。另一个对应的情况下,辅助场的行为完全一样的Faddeev-Popov鬼和相同的标度关系,在标准朗道规范,$\ka_A+2\ka_c=0$,是有效的。甚至发现参数$\ka$也相同,为0.595。出现的混合传播子在所有环路中均被抑制,其反常红外指数也可确定。第四种情况提供了更严格的标度关系,它也包括混合传播子,但具有相同的定性特征,即Faddeev-Popov鬼和辅助场的传播子是红外增强的,而混合传播子和胶子传播子是红外抑制的。在这种情况下,用于获得参数$\ka$的方程组在所有变量中都是非线性的。

英文摘要:

The low momentum behavior of the Landau gauge Gribov-Zwanziger action is investigated using the respective Dyson-Schwinger equations. Because of the mixing of the gluon and the auxiliary fields four scenarios can be distinguished for the infrared behavior. Two of them lead to inconsistencies and can be discarded. Another one corresponds to the case where the auxiliary fields behave exactly like the Faddeev-Popov ghosts and the same scaling relation as in standard Landau gauge, $\ka_A+2\ka_c=0$, is valid. Even the parameter $\ka$ is found to be the same, 0.595. The mixed propagators, which appear, are suppressed in all loops, and their anomalous infrared exponent can also be determined. A fourth case provides an even stricter scaling relation that includes also the mixed propagators, but possesses the same qualitative feature, i.e. the propagators of the Faddeev-Popov ghost and the auxiliary fields are infrared enhanced and the mixed and the gluon propagators are infrared suppressed. In this case the system of equations to obtain the parameter $\ka$ is non-linear in all variables.

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