Jackiw-Teitelboim Gravity from the Karch-Randall Braneworld

TL;DR

This paper demonstrates how Jackiw-Teitelboim gravity naturally emerges from the Karch-Randall braneworld setup, with the radion field playing the role of the dilaton, and addresses entanglement entropy ambiguities through quantum fluctuations.

Contribution

It establishes a novel connection between JT gravity and braneworld models, revealing the radion as the dilaton and resolving entanglement entropy degeneracies.

Findings

Radion acts as the dilaton in JT gravity within the braneworld.

Quantum fluctuations resolve classical entanglement entropy degeneracies.

The setup provides a new perspective on entanglement wedge reconstruction.

Abstract

In this letter, we show that Jackiw-Teitelboim (JT) gravity can be naturally realized in the Karch-Randall braneworld. Notably the role of the dilaton in JT gravity is played by the radion in a suitably orbifolded version of the setup. In the classical entanglement entropy calculation, there is an apparent degeneracy of Ryu-Takayanagi surfaces. We demonstrate how quantum fluctuations of the radion/dilaton resolves this would-be classical puzzle regarding entanglement wedge reconstruction.