Large Interval Limit of Rényi Entropy At High Temperature

Abstract

In this paper, we propose a novel expansion to compute the large interval limit of the Rényi entropy of 2D CFT at high temperature. Via the replica trick, the single interval Rényi entropy of 2D CFT at finite temperature could be read from the partition function on $n$-sheeted torus connected with each other along a branch cut. We calculate the partition function by inserting a complete basis across the branch cut. Because of the monodromy condition across the branch cut in the large interval limit, the basis of the states should be the ones in the twist sector. We study the twist sector of a general module of CFT and find that there is an one-to-one correspondence between the twist sector states and the normal sector states. As an application, we revisit the non-compact free scalar theory and discuss the large interval limit of the Rényi entropy of this theory by using our proposal. We find complete agreement in the leading and next-leading orders with direct expansion of the exact partition function. Moreover, we prove the relation (\ref{th}) between thermal entropy and the entanglement entropy for a generic CFT with discrete spectrum.

35 pages with appendices (7 pages), 4 figures, comments are welcomed; improved arguments, major correction, results unchanged;numerical analysis to support our conclusion included, in match with the published version

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• Rényi Entropy of Free Compact Boson on Torus
• Entanglement, Replicas, and Thetas
• Monodromy methods for torus conformal blocks and entanglement entropy at large central charge
• Corrections to holographic entanglement plateau
• Holographic Rényi entropy for two-dimensional N=(1,1) superconformal field theory
• Subsystem entropy in 2d CFT and KdV ETH
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• Rényi Entropy for the $\sun1$ WZW model on the torus
• Holographic Mutual Information of Two Disjoint Spheres
• Note on non-vacuum conformal family contributions to Rényi entropy in two-dimensional CFT
• Modular invariance and entanglement entropy
• Thermal Correction to Entanglement Spectrum for Conformal Field Theories