2005/11/18 by K. A. Bronnikov, J. C. Fabris · 2 citations
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1103/physrevlett.96.251101
published as Phys.Rev.Lett. 96 (2006) 251101 · revtex4, 4 pages, no figures
arxiv created 2005/11/18 · arxiv updated 2009/12/01
For self-gravitating, static, spherically symmetric, minimally coupled scalar fields with arbitrary potentials and negative kinetic energy (favored by the cosmological observations), we give a classification of possible regular solutions to the field equations with flat, de Sitter and AdS asymptotic behavior. Among the 16 presented classes of regular rsolutions are traversable wormholes, Kantowski-Sachs (KS) cosmologies beginning and ending with de Sitter stages, and asymptotically flat black holes (BHs). The Penrose diagram of a regular BH is Schwarzschild-like, but the singularity at r=0 is replaced by a de Sitter infinity, which gives a hypothetic BH explorer a chance to survive. Such solutions also lead to the idea that our Universe could be created from a phantom-dominated collapse in another universe, with KS expansion and isotropization after crossing the horizon. Explicit examples of regular solutions are built and discussed. Possible generalizations include k-essence type scalar fields (with a potential) and scalar-tensor theories of gravity.