# Symmetries Near the Horizon

## TL;DR

This paper explores the symmetries near the horizon in nearly-AdS2 gravity, constructing gauge-invariant operators that generate SL(2) transformations, linking bulk matter dynamics with boundary conformal symmetries, and relating these to the SYK model's structure and chaos.

## Contribution

It introduces gauge-invariant operators in NAdS2 that generate SL(2) symmetries and connects these to the boundary theory and SYK model, providing new insights into horizon symmetries and chaos.

## Key findings

- Operators satisfy SL(2) algebra with non-perturbative corrections.
- Generators act as boundary conformal transformations in semiclassical limit.
- Construction applies to large N, low temperature SYK model, relating to chaos.

## Abstract

We consider a nearly-AdS$_2$ gravity theory on the two-sided wormhole geometry. We construct three gauge-invariant operators in NAdS which move bulk matter relative to the dynamical boundaries. In a two-sided system, these operators satisfy an SL(2) algebra (up to non-perturbative corrections). In a semiclassical limit, these generators act like SL(2) transformations of the boundary time, or conformal symmetries of the two sided boundary theory. These can be used to define an operator-state mapping. A particular large N and low temperature limit of the SYK model has precisely the same structure, and this construction of the exact generators also applies. We also discuss approximate, but simpler, constructions of the generators in the SYK model. These are closely related to the "size" operator and are connected to the maximal chaos behavior captured by out of time order correlators.