Hawking Radiation of Linear Dilaton Black Holes in Various Theories

TL;DR

This paper investigates Hawking radiation from 4D linear dilaton black holes across various theories, revealing a precisely thermal spectrum that suggests potential information loss, contrasting with previous studies.

Contribution

It provides a detailed analysis of Hawking radiation in linear dilaton black holes using multiple models, showing a thermal spectrum and its implications for unitarity.

Findings

Hawking radiation spectrum is exactly thermal.

Tunneling rate correlates with change in Bekenstein-Hawking entropy.

Results suggest possible information loss in black hole evaporation.

Abstract

Using the Damour-Ruffini-Sannan, the Parikh-Wilczek and the thin film brick-wall models, we investigate the Hawking radiation of uncharged massive particles from 4-dimensional linear dilaton black holes, which are the solutions to Einstein-Maxwell-Dilaton, Einstein-Yang-Mills-Dilaton and Einstein-Yang-Mills-Born-Infeld-Dilaton theories. Our results show that the tunneling rate is related to the change of Bekenstein-Hawking entropy. Contrary to the many studies in the literature, here the emission spectrum is precisely thermal. This implies that the derived emission spectrum is not consistent with the unitarity of the quantum theory, which would possibly lead to the information loss.