Radiation from quantum weakly dynamical horizons in LQG

TL;DR

This paper develops a quantum gravity framework to analyze radiation from weakly dynamical horizons in Loop Quantum Gravity, connecting thermodynamics, horizon dynamics, and potential observable signatures of black hole evaporation.

Contribution

It introduces a statistical mechanical and thermodynamical analysis of isolated horizons in LQG, linking horizon radiation to quantum gravitational effects near equilibrium.

Findings

Supports the area law through thermodynamical considerations.

Derives a discrete radiation spectrum potentially observable.

Provides a quantum gravity description of horizon evaporation.

Abstract

Using the recent thermodynamical study of isolated horizons by Ghosh and Perez, we provide a statistical mechanical analysis of isolated horizons near equilibrium in the grand canonical ensemble. By matching the description of the dynamical phase in terms of weakly dynamical horizons with this local statistical framework, we introduce a notion of temperature in terms of the local surface gravity. This provides further support to the recovering of the semiclassical area law just by means of thermodynamical considerations. Moreover, it allows us to study the radiation process generated by the LQG dynamics near the horizon, providing a quantum gravity description of the horizon evaporation. For large black holes, the spectrum we derive presents a discrete structure which could be potentially observable and might be preserved even after the inclusion of all the relevant transition lines.