2011/10/27 by K. A. Bronnikov, E. V. Donskoy · 1 citation
Physics and Astronomy · #gr-qc #astro-ph.CO
paper · pdf · doi:10.1134/s0202289311020083
published as Grav. Cosmol. 17 (2), 176-180 (2011) · 5 pages, 4 figures. arXiv admin note: text overlap with arXiv:1001.3511
arxiv created 2011/10/27 · arxiv updated 2015/05/29
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 ϕwhose 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.