Tachyon Effects on the 2-Dim Black Hole Geometry

TL;DR

This paper investigates the impact of tachyon modes on two-dimensional black hole geometries, finding stability against perturbations and presenting exact and numerical solutions with varying singularity properties.

Contribution

It provides new exact and numerical solutions for 2D black holes influenced by tachyon fields, demonstrating stability and regularity features.

Findings

2D black holes are stable against tachyonic perturbations

Exact solutions with naked singularities are found

Numerical solutions show regular tachyon at the horizon

Abstract

We study solutions of the tree level string effective action in the presence of the tachyon mode.We find that the 2-dim. static black hole is stable against tachyonic perturbations.For a particular ansatz for the tachyon field we find an exact solution of the equations of motion which exhibits a naked singularity.In the case of static fields we find numerically that the full system has a black hole solution,with the tachyon regular at the horizon.