Entanglement Entropy for Relevant and Geometric Perturbations
arXiv:1410.6530 · doi:10.1007/JHEP02(2015)015
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.
18 pages + appendices
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