Abstract
We continue the study of entanglement entropy for a QFT through a perturbative expansion of the path integral definition of the reduced density matrix. The universal entanglement entropy for a CFT perturbed by a relevant operator is calculated to second order in the coupling. We also explore the geometric dependence of entanglement entropy for a deformed planar entangling surface, finding surprises at second order.
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Rosenhaus, V., Smolkin, M. Entanglement entropy for relevant and geometric perturbations. J. High Energ. Phys. 2015, 15 (2015). https://doi.org/10.1007/JHEP02(2015)015
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DOI: https://doi.org/10.1007/JHEP02(2015)015