The alpha-prime stretched horizon in the Heterotic string

TL;DR

This paper investigates how linear alpha-prime corrections can resolve singularities in half-BPS string backgrounds, transforming them into regular black holes with consistent entropy calculations.

Contribution

It demonstrates that appropriate schemes of including alpha-prime corrections turn singular solutions into regular black holes with matching entropy.

Findings

Singular backgrounds can be converted into regular black holes with alpha-prime corrections.

Modified entropy aligns with statistical entropy calculations.

Existence of schemes where all linear alpha-prime corrections are incorporated.

Abstract

The linear alpha-prime corrections and the field redefinition ambiguities are studied for half-BPS singular backgrounds representing a wrapped fundamental string. It is showed that there exist schemes in which the inclusion of all the linear alpha-prime corrections converts these singular solutions to black holes with a regular horizon for which the modified Hawking-Bekenstein entropy is in agreement with the statistical entropy.