Black Holes of a Minimal Size in String Gravity

TL;DR

This paper establishes a fundamental lower size limit for neutral black holes within string gravity models, considering higher-order curvature corrections, indicating a universal restriction across perturbative orders.

Contribution

It demonstrates that the minimal black hole size persists even when including third order curvature corrections, suggesting a universal lower bound in string gravity.

Findings

A lower size limit for neutral black holes in string gravity.

The minimal size restriction remains with third order curvature corrections.

The restriction likely applies to all perturbative curvature orders.

Abstract

A lower limit for a neutral black hole size is obtained in the frames of the string gravity model with the second order curvature correction. It is shown that this effect remains when the third order curvature correction is also taken into account and argued that such restriction does exist in all perturbative orders of curvature expansions.