# Non-conformal entanglement entropy

## TL;DR

This paper investigates the behavior of renormalized entanglement entropy across various holographic models, revealing its ability to capture both UV and IR features, especially in symmetry-breaking scenarios.

## Contribution

It demonstrates that renormalized entanglement entropy encodes IR physics and symmetry-breaking effects, extending the understanding beyond the entropic c-function in holographic models.

## Key findings

- Renormalized entanglement entropy captures deep IR behavior.
- In symmetry-breaking theories, it saturates for large regions.
- It reflects features not seen by the entropic c-function.

## Abstract

We explore the behaviour of renormalized entanglement entropy in a variety of holographic models: non-conformal branes; the Witten model for QCD; UV conformal RG flows driven by explicit and spontaneous symmetry breaking and Schr\"odinger geometries. Focussing on slab entangling regions, we find that the renormalized entanglement entropy captures features of the previously defined entropic c-function but also captures deep IR behaviour that is not seen by the c-function. In particular, in theories with symmetry breaking, the renormalized entanglement entropy saturates for large entangling regions to values that are controlled by the symmetry breaking parameters.