Time-dependent perturbations in two-dimensional String Black Holes

TL;DR

This paper investigates how matter fields induce time-dependent changes in two-dimensional string black holes, revealing conditions for evolving horizons and potential links to black hole decay processes.

Contribution

It demonstrates the existence of time-dependent horizon solutions in 2D string black holes and explores their implications for black hole evaporation at a quantum level.

Findings

Time-dependent horizons exist with tachyon matter fields.

Real tachyon configurations cannot shrink horizons to a point.

Higher genus models suggest possible black hole decay scenarios.

Abstract

We discuss time-dependent perturbations (induced by matter fields) of a black-hole background in tree-level two-dimensional string theory. We analyse the linearized case and show the possibility of having black-hole solutions with time-dependent horizons. The latter exist only in the presence of time-dependent `tachyon' matter fields, which constitute the only propagating degrees of freedom in two-dimensional string theory. For real tachyon field configurations it is not possible to obtain solutions with horizons shrinking to a point. On the other hand, such a possibility seems to be realized in the case of string black-hole models formulated on higher world-sheet genera. We connect this latter result with black hole evaporation/decay at a quantum level.}