# Entanglement Entropy and Conformal Collider Physics in 2D CFTs

## TL;DR

This paper investigates the relationship between entanglement entropy and energy flux in 2D conformal field theories with external perturbations, highlighting their light-cone singularities and dependence on regularization.

## Contribution

It provides new insights into the connection between entanglement entropy and energy flux in 2D CFTs under external perturbations, including their singularity structures.

## Key findings

- Both entanglement entropy and energy flux show light-cone singularities.
- The singularities depend strongly on the regularization scheme.
- A proposed relation between entanglement entropy and energy flux in some cases.

## Abstract

We consider a conformal field theory in two dimensions in which an external perturbation is placed. We study the energy flux and entanglement entropy for one, two and multiple intervals and give a suggestion relating the two in some cases. We show that both the energy flux and the entanglement entropy exhibit a light-cone singularity which strongly depends on the regularization we choose.