Comments on the non-existence of unified hoop conjecture
General Relativity and Quantum Cosmology
2026-07-01 v1
Abstract
In a recent article, Hod [1] has concluded the non-existence, heretofore unnoticed, of a unified Thorne's hoop conjecture that holds for the quasi-local mass, for static Reissner-Nordstr\H{o}m black hole, but does not hold for the spinning electrically charged Kerr-Newman black holes, when the same quasi-local mass is used. While the conclusion is correct and important, we wish to point out a curious exception for which the conjecture holds in a unified way for both the static and spinning \textit{tidal} charged braneworld black holes of string theory, when the mass in the conjecture is the same quasi-local mass.
Keywords
Cite
@article{arxiv.2607.00390,
title = {Comments on the non-existence of unified hoop conjecture},
author = {A. Bhattacharya and R. N. Izmailov and R. Kh. Karimov},
journal= {arXiv preprint arXiv:2607.00390},
year = {2026}
}
Comments
6 pages, 1 figure, 1 table