Black universes with trapped ghosts

Details Black universes with trapped ghosts Black universes with trapped ghosts

2011-10-27

arxiv.org/abs/1110.6030v1

Grav. Cosmol. 17 (2), 176-180 (2011)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 4 figures. arXiv admin note: text overlap with arXiv:1001.3511

Scientific paper

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.

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