Boundary Description of Microstates of the Two-Dimensional Black Hole

TL;DR

This paper identifies and characterizes the microstates of a 2D black hole in dual matrix quantum mechanics, revealing a novel bound state that models black hole microstates with realistic evaporation behavior.

Contribution

It explicitly constructs the microstates of a 2D black hole in the dual MQM and computes the partition function, resolving previous conflicting results.

Findings

Reproduced the partition function using Hamiltonian methods.

Identified a long-lived bound state as the dual of black hole microstates.

Calculated the entropy and energy of the microstates.

Abstract

We identify the microstates of the non supersymmetric, asymptotically flat 2d black hole in the dual c=1 matrix quantum mechanics (MQM). We calculate the partition function of the theory using Hamiltonian methods and reproduce one of two conflicting results found by Kazakov and Tseytlin. We find the entropy by counting states and the energy by solving the Schrodinger equation. The dominant contribution to the partition function in the double scaling limit is a novel bound state that can be considered an explicit dual of the black hole microstates. This bound state is long lived and evaporates slowly, exactly like a black hole in asymptotically flat space.