Anomaly matching in the symmetry broken phase: Domain walls, CPT, and the Smith isomorphism

@article{Hason2019AnomalyMI,
  title={Anomaly matching in the symmetry broken phase: Domain walls, CPT, and the Smith isomorphism},
  author={Itamar Hason and Z. Komargodski and Ryan Thorngren},
  journal={arXiv: High Energy Physics - Theory},
  year={2019}
}
Symmetries in Quantum Field Theory may have 't Hooft anomalies. If the symmetry is unbroken in the vacuum, the anomaly implies a nontrivial low-energy limit, such as gapless modes or a topological field theory. If the symmetry is spontaneously broken, for the continuous case, the anomaly implies low-energy theorems about certain couplings of the Goldstone modes. Here we study the case of spontaneously broken discrete symmetries, such as Z/2 and T. Symmetry breaking leads to domain walls, and… 

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