Hyperbolic cylinders and entanglement entropy: gravitons, higher spins, $p$-forms

TL;DR

This paper demonstrates the equivalence of entanglement entropy calculations for gravitons and higher spins using different methods, and explores the properties of conformal p-forms and twist operators in various dimensions.

Contribution

It provides a novel comparison of entanglement entropy for gravitons and higher spins via Kaluza-Klein towers and hyperbolic cylinder partition functions, confirming recent conjectures.

Findings

Entanglement entropy of gravitons matches across methods.

Conformal dimensions of twist operators align with stress tensor expectations.

Higher spin entanglement entropy obeys expected conformal relations.

Abstract

We show that the entanglement entropy of $D=4$ linearized gravitons across a sphere recently computed by Benedetti and Casini coincides with that obtained using the Kaluza-Klein tower of traceless transverse massive spin-2 fields on $S^1\times AdS_3$. The mass of the constant mode on $S^1$ saturates the Brietenholer-Freedman bound in $AdS_3$. This condition also ensures that the entanglement entropy of higher spins determined from partition functions on the hyperbolic cylinder coincides with their recent conjecture. Starting from the action of the 2-form on $S^1\times AdS_5$ and fixing gauge, we evaluate the entanglement entropy across a sphere as well as the dimensions of the corresponding twist operator. We demonstrate that the conformal dimensions of the corresponding twist operator agrees with that obtained using the expectation value of the stress tensor on the replica cone. For conformal $p$-forms in even dimensions it obeys the expected relations with the coefficients determining the $3$-point function of the stress tensor of these fields.