COSMO'22

De-singularizing the extremal GMGHS black hole via higher derivatives corrections

25 Aug 2022, 15:00

20m

Rio de Janeiro

Plenary/Parallel talk Gravitational waves and black holes Parallel Session Lecture Room

Speaker

Kunihito Uzawa (Kwansei Gakuin University)

Description

The Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS)
black hole is an influential solution of the low energy heterotic
string theory. As it is well known, it presents a singular extremal
limit. We construct a regular extension of the GMGHS extremal black
hole in a model with $\mathcal{O}({\alpha }^{\prime })$ corrections in the action,
by solving the fully non-linear equations of motion. The
de-singularization is supported by the $\mathcal{O}({\alpha }^{\prime })$-terms.
The regularised extremal GMGHS BHs are asymptotically flat, possess a
regular (non-zero size) horizon of spherical topology, with an
$Ad{S}_2\times S^2$ near horizon geometry, and their entropy is
proportional to the electric charge. The near horizon solution is
obtained analytically and some illustrative bulk solutions are
constructed numerically.

Presentation materials

Kunihito Uzawa.pdf