Observations on entanglement entropy in massive QFT’s

A bstractWe identify various universal contributions to the entanglement entropy for massive free fields. As well as the ‘area’ terms found in [1], we find other geometric contributions of the form discussed in [2]. We also compute analogous contributions for a strongly coupled field theory using the AdS/CFT correspondence. In this case, we find the results for strong and weak coupling do not agree.

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