Exact late time Hawking radiation and the information loss problem for evaporating near-extremal black holes

TL;DR

This paper analyzes the late-time Hawking radiation of near-extremal black holes, showing that gravitational backreaction causes the radiation to decrease exponentially, which has implications for the black hole information loss paradox.

Contribution

It provides an exact analysis of late-time Hawking radiation considering backreaction effects using an effective one-loop model on AdS_2, offering new insights into information preservation.

Findings

Hawking flux decreases exponentially over time

Boundary of AdS_2 acts like a stretched horizon

Initial state information may not be lost

Abstract

In this paper we investigate the effects of gravitational backreaction for the late time Hawking radiation of evaporating near-extremal black holes. This problem can be studied within the framework of an effective one-loop solvable model on AdS_2. We find that the Hawking flux goes down exponentially and it is proportional to a parameter which depends on details of the collapsing matter. This result seems to suggest that the information of the initial state is not lost and that the boundary of AdS_2 acts, at least at late times, as a sort of stretched horizon in the Reissner-Nordstrom spacetime.