Black universes with trapped ghosts
Abstract
A black universe is a nonsingular black hole where, beyond the horizon, there is an expanding, asymptotically isotropic universe. Such models have been previously found as solutions of general relativity with a phantom scalar field as a source of gravity and, without phantoms, in a brane world of RS2 type. Here we construct examples of static, spherically symmetric black-universe solutions in general relativity with a minimally coupled scalar field \phi whose kinetic energy is negative in a restricted strong-field region of space-time and positive outside it. Thus in such configurations a "ghost" is trapped in a small part of space, which may in principle explain why no ghosts are observed under usual conditions.
Cite
@article{arxiv.1110.6030,
title = {Black universes with trapped ghosts},
author = {K. A. Bronnikov and E. V. Donskoy},
journal= {arXiv preprint arXiv:1110.6030},
year = {2015}
}
Comments
5 pages, 4 figures. arXiv admin note: text overlap with arXiv:1001.3511