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Entanglement Entropy of Electromagnetic Edge Modes
2015
Physical Review Letters
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The vacuum entanglement entropy of Maxwell theory, when evaluated by standard methods, contains an unexpected term with no known statistical interpretation. We resolve this two-decades old puzzle by showing that this term is the entanglement entropy of edge modes: classical solutions determined by the electric field normal to the entangling surface. We explain how the heat kernel regularization applied to this term leads to the negative divergent expression found by Kabat. This calculation also
doi:10.1103/physrevlett.114.111603
pmid:25839259
fatcat:46vcc3hewrel3nta46ipevrtqm