Holographic entanglement entropy and complexity of microstate geometries

TL;DR

This paper investigates holographic entanglement entropy and complexity in a family of type IIB supergravity solutions, revealing no entanglement shadow formation and a monotonic complexity transition between pure AdS and massless BTZ geometries.

Contribution

It introduces a detailed analysis of entanglement entropy and complexity for a family of microstate geometries, highlighting the absence of entanglement shadows and the monotonic behavior of complexity.

Findings

No entanglement shadow for all parameter values.

Complexity of formation smoothly interpolates between AdS and BTZ geometries.

Geometries are dual to pure heavy states in the CFT.

Abstract

We study holographic entanglement entropy and holographic complexity in a two-charge, $\frac{1}{4}$-BPS family of solutions of type IIB supergravity, controlled by one dimensionless parameter. All the geometries in this family are asymptotically AdS$_3 \times \mathbb{S}^3 \times \mathbb{T}^4$ and, varying the parameter that controls them, they interpolates between the global AdS$_3 \times \mathbb{S}^3 \times \mathbb{T}^4$ and the massless BTZ$_3 \times \mathbb{S}^3 \times \mathbb{T}^4$ geometry. Due to AdS/CFT duality, these geometries are dual to pure CFT heavy states. We find that there is no emergence of entanglement shadow for all the values of the parameter and we discuss the relation with the massless BTZ result, underlying the relevance of the nature of the dual states. We also compute the holographic complexity of formation of these geometries, finding a nice monotonic function that interpolates between the pure AdS$_3$ result and the massless BTZ one.