English

Are There Four-Dimensional Small Black Rings?

High Energy Physics - Theory 2008-11-26 v2

Abstract

In d>4 dimensions, one can argue for the existence of small black rings using a scaling argument. We apply the same scaling argument to the d=4 case and demonstrate that it fails to say anything about the existence of d=4 small black rings, because stringy corrections get out of control. General relativity theorems say that there does not exist a black hole with toroidal topology for d=4, but we interpret this as saying that, for d=4 small black rings, stringy corrections are crucial which invalidate the assumptions those theorems are based on.

Cite

@article{arxiv.0710.4139,
  title  = {Are There Four-Dimensional Small Black Rings?},
  author = {Norihiro Iizuka and Masaki Shigemori},
  journal= {arXiv preprint arXiv:0710.4139},
  year   = {2008}
}

Comments

12 pages. v2: references added

R2 v1 2026-06-21T09:34:50.949Z