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arXiv 1606.08012hep-thhep-lathep-phnucl-th
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跨退禁闭相变的Yang-Mills关联函数

Yang-Mills correlators across the deconfinement phase transition

U. Reinosa, J. Serreau, M. Tissier, A. Tresmontant

摘要:

在Landau-DeWitt规范下计算了杨-米尔斯理论的有限温度鬼子和胶子传播子。进入后者定义的背景场与(规范不变)Polyakov回路密切相关,并作为退禁闭过渡的等效序参量。我们使用一个有效的规范固定的描述的非微扰红外动力学的理论参数化的胶子质量,如其他地方所争论的,可能源于Gribov的模糊性。在这个方案中,我们可以进行一致的微扰计算,直到红外动量,这已被证明是正确的描述在四维的杨米尔斯理论的相图,以及零温度关联函数在晶格模拟计算。在这篇文章中,我们给出了一大类规范群的有限温度朗道-德威特鬼和胶子传播子的单圈表达式,并给出了SU(2)情况下的明确结果。这些是从以前获得的朗道规范,这对应于一个消失的背景场有很大的不同。整个过渡的序参量的非解析性直接印在各种颜色模式的传播子上。例如,在SU(2)的情况下,这导致了电胶子和磁胶子磁化率的尖点,以及鬼扇区中的类似特征。我们提到的可能性,这种独特的功能的过渡可以测量在晶格模拟在这里研究的背景场规范。

英文摘要:

We compute the finite temperature ghost and gluon propagators of Yang-Mills theory in the Landau-DeWitt gauge. The background field that enters the definition of the latter is intimately related with the (gauge-invariant) Polyakov loop and serves as an equivalent order parameter for the deconfinement transition. We use an effective gauge-fixed description where the nonperturbative infrared dynamics of the theory is parametrized by a gluon mass which, as argued elsewhere, may originate from the Gribov ambiguity. In this scheme, one can perform consistent perturbative calculations down to infrared momenta, which have been shown to correctly describe the phase diagram of Yang-Mills theories in four dimensions as well as the zero-temperature correlators computed in lattice simulations. In this article, we provide the one-loop expressions of the finite temperature Landau-DeWitt ghost and gluon propagators for a large class of gauge groups and present explicit results for the SU(2) case. These are substantially different from those previously obtained in the Landau gauge, which corresponds to a vanishing background field. The nonanalyticity of the order parameter across the transition is directly imprinted onto the propagators in the various color modes. In the SU(2) case, this leads, for instance, to a cusp in the electric and magnetic gluon susceptibilities as well as similar signatures in the ghost sector. We mention the possibility that such distinctive features of the transition could be measured in lattice simulations in the background field gauge studied here.

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