Higher Spin Entanglement Entropy

TL;DR

This work develops a perturbative framework to compute higher spin Rényi and entanglement entropies (HSRE and HSEE) in two-dimensional CFTs with W_infty(lambda) symmetry at finite temperature and under higher spin chemical potentials. By exploiting a multivalued conformal map from the n-sheeted replica surface to the complex plane, the authors systematically evaluate correlation functions of higher-spin currents and obtain results up to O(mu^4), including universal O(mu^2) behavior and quantum corrections at O(mu^4). In the spin-3 sector, the large-c, lambda=3 case reproduces the tree-level holographic entropy from the Wilson line prescription, while quantum corrections reveal a lambda-independent universal structure. The findings extend the HS/CFT correspondence checks to HSRE/HSEE and provide a CFT-side method applicable to general W-symmetric theories, with clear implications for higher-spin gravity and its quantum properties.

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 $\mathcal{W}_{\infty}(λ)$ 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 $\mathcal{O}(μ^2)$. For spin 3 deformation, we calculate exact higher spin R$\acute{e}$nyi entropy up to $\mathcal{O}(μ^4)$. When $λ=3$, in the large $c$ limit, we find perfect match with tree level holographic higher spin entanglement entropy up to order $μ^4$ 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 $μ^4$ in the sense that it is independent of $λ$. 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.