等离激元对热A_0凝聚的贡献
On plasmon contribution to the hot A_0 condensate
摘要：
在SU（2）胶子动力学中，计算了高温下德拜胶子对时间规范场分量A_0 = const的有效作用量的贡献W_D（A_0）.结果表明，在非零A_0处，标准定义k_0 = 0，|k| -> 0对应于内部空间胶子的长距离关联。横向胶子被A_0背景场屏蔽。因此，它们的贡献为零，必须从相关校正中排除。考虑单圈、双圈和修正W_D（A_0）的总有效作用量满足Nielsen恒等式，证明了A_0凝聚现象的规范不变性。
英文摘要：
In SU(2) gluodynamics, the Debye gluon contribution W_D(A_0) to the effective action of the temporal gauge field component, A_0 = const, at high temperature is calculated in the background R^{xi} gauge. It is shown that at nonzero A_0 the standard definition k_0 = 0, |k| -> 0 corresponds to long distance correlations for the longitudinal in internal space gluons. The transversal gluons become screened by the A_0 background field. Therefore they give zero contributions and have to be excluded from the correlation corrections. The total effective action accounting for the one-loop, two-loop and correct W_D(A_0) satisfies Nielsen's identity that proves gauge invariance of the A_0 condensation phenomenon.
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