Observations on entanglement entropy in massive QFT's
Aitor Lewkowycz, Robert C. Myers, Michael Smolkin
TL;DR
This paper investigates universal contributions to entanglement entropy in massive quantum field theories, comparing free and strongly coupled cases, revealing discrepancies between strong and weak coupling results.
Contribution
It identifies new geometric contributions to entanglement entropy in massive free fields and compares these with holographic results at strong coupling, highlighting differences.
Findings
Universal geometric contributions identified in free fields
Discrepancies found between strong and weak coupling results
AdS/CFT correspondence used to compute strongly coupled case
Abstract
We 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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