Entropic c-functions in $T{\bar T}, J{\bar T}, T{\bar J}$ deformations

TL;DR

This paper investigates the holographic entanglement entropy in deformed 2D conformal field theories, revealing a regulator-independent entropic c-function that exhibits non-decreasing behavior and specific divergences along the RG flow.

Contribution

It introduces a detailed analysis of the entropic c-function in $T{ar T}, J{ar T}, T{ar J}$ deformed theories, highlighting its universal properties and novel divergence behavior.

Findings

Entropic c-function is ultraviolet regulator independent.

The c-function is non-decreasing along the RG flow.

Entanglement entropy exhibits a power law divergence at a finite interval length.

Abstract

We study the holographic entanglement entropy of an interval in a quantum field theory obtained by deforming a holographic two-dimensional conformal field theory via a general linear combination of irrelevant operators that are closely related to, but nonetheless distinct from, $T{\bar T}, \ J{\bar T}$ and $T{\bar J}$, and compute the Casin-Huerta entropic $c$-function. We find that the entropic $c$-function is ultraviolet regulator independent, and along the renormalization group upflow towards the ultraviolet, it is non-decreasing. We show that the entropic $c$-function exhibits a power law divergence as the interval length approaches a minimum finite value determined in terms of the deformation parameters. We also find for a particular combination of the deformation parameters a square root correction of the entanglement entropy area law.