# Flat Space Holography via AdS/BCFT

## TL;DR

This paper introduces a novel AdS/BCFT framework with flat space EOW branes to study flat space holography, revealing dualities with Carrollian CFTs and providing new insights into entanglement and correlation in boundary theories.

## Contribution

It proposes a new class of AdS/BCFT models with flat EOW branes, connecting flat space holography to Carrollian CFTs and offering fresh predictions for boundary field theories.

## Key findings

- Gravity duals of CFTs with null boundaries are constructed.
- New predictions for entanglement entropy and correlation functions.
- Flat space gravity is shown to be dual to Carrollian CFTs.

## Abstract

In this paper, we study a new class of AdS/BCFT setups, where the world-volumes of end-of-the-world branes (EOW branes) are given by flat spaces, to explore flat space holography from an AdS bulk. We show that they provide gravity duals of CFTs in the presence of null boundaries. Our holographic calculations lead to many new predictions on entanglement entropy, correlation functions and partition functions for CFTs with null boundaries. By considering a bulk region between two EOW branes, we present an AdS/BCFT explanation that the flat space gravity is dual to a Carrollian CFT (CCFT), including the swing surface calculation of entanglement entropy.