Logarithmic coefficient of the entanglement entropy of a Maxwell field

@article{Casini2020LogarithmicCO,
  title={Logarithmic coefficient of the entanglement entropy of a Maxwell field},
  author={Horacio Casini and Marina Huerta and Javier M. Mag{\'a}n and Diego Pontello},
  journal={Physical Review D},
  year={2020}
}
We elucidate the mismatch between the $A$-anomaly coefficient and the coefficient of the logarithmic term in the entanglement entropy of a Maxwell field. In contrast to the usual assumptions about the protection of renormalization group charges at the infrared, the logarithmic term is different for a free Maxwell field and a Maxwell field interacting with heavy charges. This is possible because of the presence of superselection sectors in the IR theory. However, the correction due to the… 

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