The Path Integral Formulation of Gravitational Thermodynamics

TL;DR

This paper develops a path integral approach to gravitational thermodynamics, stabilizing black holes with a boundary to analyze their entropy and thermodynamic properties.

Contribution

It introduces a path integral formulation for black hole thermodynamics using a finite boundary, providing a foundation for understanding black hole entropy.

Findings

Black hole partition function can be stabilized with a finite boundary.

Black hole entropy relates to missing inner boundary information.

The approach offers a logical basis for black hole thermodynamics.

Abstract

The first objective of this article is to show that the black hole partition function can be placed on a firm logical foundation by enclosing the black hole in a spatially finite "box" or boundary. The presence of the box has the effect of stabilizing the black hole and yields a system with a positive heat capacity. The second objective of this article is to explore the origin of black hole entropy. This is accomplished through the construction of a path integral expression for the density matrix for the gravitational field, and through an analysis of the connection between the density matrix and the black hole density of states. Our results suggest that black hole entropy can be associated with an absence of certain "inner boundary information" for the system. (Based on the talk presented by J.D. Brown at the conference "The Black Hole 25 Years After", Santiago, Chile, January 1994.)