The Endpoint of Hawking Evaporation

Abstract

The formation and semi-classical evaporation of two-dimensional black holes is studied in an exactly solvable model. Above a certain threshold energy flux, collapsing matter forms a singularity inside an apparent horizon. As the black hole evaporates the apparent horizon recedes and meets the singularity in a finite proper time. The singularity emerges naked and future evolution of the geometry requires boundary conditions to be imposed there. There is a natural choice of boundary conditions which match the evaporated black hole solution onto the linear dilaton vacuum. Below the threshold energy flux no horizon forms and boundary conditions can be imposed where infalling matter is reflected from a time-like naked singularity. All information is recovered at spatial infinity in this case.

14 pages, 2 figures (not included)

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• Evanescent Black Holes
• Are Horned Particles the Climax of Hawking Evaporation?
• Evaporation of Two Dimensional Black Holes
• Scalar-Tensor Quantum Gravity in Two Dimensions
• Quantum Black Holes
• Information Loss and Anomalous Scattering

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