Quantum black-hole information missing in the semiclassical treatment

TL;DR

This paper discusses how quantum gravity allows an external observer to measure the exact black hole mass, revealing information leakage during evaporation that is not captured in semiclassical models.

Contribution

It highlights the importance of quantum gravity in understanding black hole information loss, emphasizing the measurable differences in black hole mass.

Findings

Quantum gravity enables measurement of exact black hole mass.

Exact mass measurement provides insights into information leakage.

Semiclassical models only access average black hole properties.

Abstract

In the semiclassical treatment of gravity, an external observer can measure only the mean (not the exact) mass of the black hole (BH). By contrast, in fully quantum gravity the exact (not only mean) BH mass is measurable by the external observer. This additional information (missing in the semiclassical treatment) available to the external observer significantly helps to understand how information leaks out during the BH evaporation.