Two-dimensional regular string black hole via complete a' corrections

In string theory, an important challenge is to show if the singularity of black holes can be smoothed out by the complete a' corrections. The simplest case is to consider a 2D string black hole or 3D black string. This problem was discussed in a gauged Wess-Zumino-Witten (WZW) model and the results are supposed to be correct to all orders in a' corrections. Based on the recent remarkable progress on classifying all the a' corrections, in this work, we re-study this problem with the low energy effective spacetime action, and provide classes of exact non-perturbative and non-singular solutions of the 2D black hole/3D black string via complete a' corrections.

Automated summary

This study investigates the smoothing out of black hole singularities in string theory. By considering 2D string black holes and 3D black strings, and using the low energy effective spacetime action, the study provides classes of exact non-perturbative and non-singular solutions of these black holes/strings through complete a' corrections.