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arXiv 0704.2349hep-th
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精确重整化群中QED的量子主方程

Quantum Master Equation for QED in Exact Renormalization Group

Yuji Igarashi, Katsumi Itoh, Hidenori Sonoda

摘要:

最近,我们中的一个(H. S.)给出了量子电动力学Wilson作用量的Ward-Takahashi恒等式的一个显式。我们首先使用函数方法重新推导恒等式。这个恒等式使得即使在存在动量截止的情况下也能实现规范对称性。在截断依赖实现中,规范对称性的阿贝尔性质丧失,打破了BRS变换的幂零性。使用Batalin-Vilkovisky形式主义,我们通过包括反场贡献来扩展Wilson作用。然后,威尔逊作用量的Ward-Takahashi恒等式被提升到量子主方程,并且修改的BRS变换恢复了幂零性。我们还得到了扩展Wilson作用量的流方程。

英文摘要:

Recently, one of us (H.S.) gave an explicit form of the Ward-Takahashi identity for the Wilson action of QED. We first rederive the identity using a functional method. The identity makes it possible to realize the gauge symmetry even in the presence of a momentum cutoff. In the cutoff dependent realization, the abelian nature of the gauge symmetry is lost, breaking the nilpotency of the BRS transformation. Using the Batalin-Vilkovisky formalism, we extend the Wilson action by including the antifield contributions. Then, the Ward-Takahashi identity for the Wilson action is lifted to a quantum master equation, and the modified BRS transformation regains nilpotency. We also obtain a flow equation for the extended Wilson action.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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