Hawking radiation of nonsingular black holes in two dimensions

Abstract

In this letter we study the process of Hawking radiation of a black hole assuming the existence of a limiting physical curvature scale. The particular model is constructed using the Limiting Curvature Hypothesis (LCH) and in the context of two-dimensional dilaton gravity. The black hole solution exhibits properties of the standard Schwarzschild solution at large values of the radial coordinate. However, near the center, the black hole is nonsingular and the metric becomes that of de Sitter spacetime. The Hawking temperature is calculated using the method of complex paths. We find that such black holes radiate eternally and never completely evaporate. The final state is an eternally radiating relic, near the fundamental scale, which should make a viable dark matter candidate. We briefly comment on the black hole information loss problem and the production of such black holes in collider experiments.

8 pages, 4 figures; minor revisions; references added; version to appear in JHEP

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• Dilaton Gravity in Two Dimensions
• Liouville Field Theory -- A decade after the revolution
• String Model with Dynamical Geometry and Torsion

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