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arXiv 1107.3987hep-th
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四维空间的重整化群流

On Renormalization Group Flows in Four Dimensions

Zohar Komargodski, Adam Schwimmer

摘要:

我们讨论了四维空间中重整化群流的一些一般性问题。每一个这样的流动都可以用自发破缺的共形对称性来重新解释。我们详细分析的后果痕迹异常的有效行动的南武-戈德斯通玻色子破缺的共形对称性。虽然c-反常在代数上是平凡的,但a-反常是“非阿贝尔的”,并导致对2->2介子散射的S-矩阵的正定普适贡献。S-矩阵的酉性导致在紫外线和红外线中的欧拉异常之间插值的单调递减函数,从而建立a-定理。

英文摘要:

We discuss some general aspects of renormalization group flows in four dimensions. Every such flow can be reinterpreted in terms of a spontaneously broken conformal symmetry. We analyze in detail the consequences of trace anomalies for the effective action of the Nambu-Goldstone boson of broken conformal symmetry. While the c-anomaly is algebraically trivial, the a-anomaly is "non-Abelian," and leads to a positive-definite universal contribution to the S-matrix of 2->2 dilaton scattering. Unitarity of the S-matrix results in a monotonically decreasing function that interpolates between the Euler anomalies in the ultraviolet and the infrared, thereby establishing the a-theorem.

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