Two-dimensional dilaton black holes

TL;DR

This paper extends the two-dimensional CGHS black hole model by developing a generalized effective action that reduces singularities and confirms consistent Hawking radiation flux, enhancing understanding of black hole evaporation.

Contribution

The paper introduces a generalized effective action for 2D dilaton black holes that removes certain singularities and matches known Hawking radiation flux results.

Findings

Removal of specific curvature singularities

Hawking radiation flux matches other 2D models

Enhanced model for black hole evaporation studies

Abstract

The two-dimensional CGHS model provides an interesting toy-model for the study of black hole evaporation. For this model, a quantum effective action, which incorporates Hawking radiation and backreaction, can be explicitly constructed. In this paper, we study a generalization of this effective action. In our extended model, it is possible to remove certain curvature singularities arising for the original theory. We also find that the flux of Hawking radiation is identical to that encountered in other two-dimensional models.