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arXiv 0909.0327hep-th
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量子场论的ERG方法中对称性的实现

Realization of symmetry in the ERG approach to quantum field theory

Yuji Igarashi, Katsumi Itoh, Hidenori Sonoda

摘要:

本文综述了在可重整化场论中使用精确重整化群来实现对称性。审查包括三个部分。在第一部分(Sect. 2,3,4),我们从微扰构造可重整化场论作为精确重整化群(ERG)微分方程的解开始。我们展示了如何通过一个适当的渐近行为的解决方案,一个大的动量截止的特征重整化。重整化参数的引入,以控制渐近行为。在第二部分(第二节)中,5- 9),我们介绍了两种形式主义,以纳入对称性:一个通过强加的沃德-高桥恒等式,另一个通过施加广义沃德-高桥恒等式通过源,产生对称变换。我们将这两种形式应用到具体的模型中,如QED,YM理论,四维的Wess-Zumino模型和二维的O(N)非线性西格玛模型。最后我们计算了阿贝尔轴反常和手征反常。在第三部分(第三节)中,10,11),我们概述了Batalin-Vilkovisky形式主义适用于具有UV截止的裸理论的Wilson作用量。我们提供了一些附录来提供细节和扩展,这些细节和扩展可以省略,以便理解正文。最后一个附录是一个简短的总结,以方便读者。

英文摘要:

We review the use of the exact renormalization group for realization of symmetry in renormalizable field theories. The review consists of three parts. In part I (sects. 2,3,4), we start with the perturbative construction of a renormalizable field theory as a solution of the exact renormalization group (ERG) differential equation. We show how to characterize renormalizability by an appropriate asymptotic behavior of the solution for a large momentum cutoff. Renormalized parameters are introduced to control the asymptotic behavior. In part II (sects. 5--9), we introduce two formalisms to incorporate symmetry: one by imposing the Ward-Takahashi identity, and another by imposing the generalized Ward-Takahashi identity via sources that generate symmetry transformations. We apply the two formalisms to concrete models such as QED, YM theories, and the Wess-Zumino model in four dimensions, and the O(N) non-linear sigma model in two dimensions. We end this part with calculations of the abelian axial and chiral anomalies. In part III (sects. 10,11), we overview the Batalin-Vilkovisky formalism adapted to the Wilson action of a bare theory with a UV cutoff. We provide a few appendices to give details and extensions that can be omitted for the understanding of the main text. The last appendix is a quick summary for the reader's convenience.

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