On renormalization group flows in four dimensions

@article{Komargodski2011OnRG,
  title={On renormalization group flows in four dimensions},
  author={Zohar Komargodski and Adam Schwimmer},
  journal={Journal of High Energy Physics},
  year={2011},
  volume={2011},
  pages={1-20}
}
A bstractWe 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 element of 2 → 2 dilaton… 

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