Higher Spin Entanglement Entropy

TL;DR

This paper develops a perturbation method to compute higher spin entanglement entropy in 2D conformal field theories with $ ext{W}_ ext{infinity}( ext{lambda})$ symmetry, matching holographic results and revealing quantum corrections.

Contribution

It introduces a novel perturbation approach for higher spin entanglement entropy calculations, including quantum corrections, applicable to general $ ext{W}$-symmetric conformal field theories.

Findings

Computed higher spin R$ ext{e}$nyi entropy up to $ ext{O}( ext{mu}^2)$ for various spins.

Matched large $c$ holographic results at $ ext{lambda}=3$ up to $ ext{O}( ext{mu}^4)$.

Identified universal quantum corrections at $ ext{O}( ext{mu}^4)$ independent of $ ext{lambda}$.

Abstract

In this paper, we develop a perturbation formulation to calculate the single interval higher spin R$\acute{e}$nyi and entanglement entropy for two dimensional conformal field theory with $\mathcal{W}_{\infty}(\lambda)$ symmetry. The system is at finite temperature and is deformed by higher spin chemical potential. We manage to compute higher spin R$\acute{e}$nyi entropy with various spin deformations up to order $\mathcal{O}(\mu^2)$. For spin 3 deformation, we calculate exact higher spin R$\acute{e}$nyi entropy up to $\mathcal{O}(\mu^4)$. When $\lambda=3$, in the large $c$ limit, we find perfect match with tree level holographic higher spin entanglement entropy up to order $\mu^4$ obtained by the Wilson line prescription. We also find quantum corrections to higher spin entanglement entropy which is beyond tree level holographic results. The quantum correction is universal at order $\mu^4$ in the sense that it is independent of $\lambda$. Our computation relies on a multi-valued conformal map from $n$-sheeted Riemann surface $\mathcal{R}_n$ to complex plane and correlation functions of primary fields on complex plane. The method can be applied to general conformal field theories with $\mathcal{W}$ symmetry.