Tachyon Effects on the 2-Dim Black Hole Geometry

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.

NTUA 45/94, Pages 11, Latex, 3 Figures on request

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