T-S-T dual black hole

TL;DR

This paper explores a novel black hole solution derived from T-S-T duality transformations, revealing a duality between black and white holes and suggesting strings may avoid singularities.

Contribution

It introduces a new black hole background obtained via T-S-T duality, showing the extendibility of the spacetime and the duality between black and white hole behaviors.

Findings

Black hole and white hole horizons are dual under T-S-T transformations.

The new spacetime background is extendible beyond the horizon.

Strings may not perceive singularities due to duality effects.

Abstract

The sequence of intertwined T-S-T duality transformations acting on the 4D static uncharged black hole leads to a new black hole background with horizon and singularity exchanged. It is shown that this space-time is extendible too. In particular we will see that a string moving into a black hole is dual to a string leaving a white hole. That offers the possibility that a test-string does not see the singularity.