Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102358
Title: Wormholes and naked singularities in Brans-Dicke cosmology
Authors: Tretyakova, D. A.
Latosh, B. N.
Alexeyev, S. O.
Issue Date: 2015
Publisher: Institute of Physics Publishing
Citation: Tretyakova D. A. Wormholes and naked singularities in Brans-Dicke cosmology / D. A. Tretyakova, B. N. Latosh, S. O. Alexeyev. — DOI 10.1088/0264-9381/32/18/185002 // Classical and Quantum Gravity. — 2015. — Vol. 32. — Iss. 18. — 185002.
Abstract: We perform an analytical and numerical study of static spherically symmetric solutions in the context of the Brans-Dicke-like cosmological model by Elizalde et al (2004 Phys. Rev. D 70 043539) with an exponential potential. In this model the phantom regime arises without the appearance of any ghost degree of freedom due to the specific form of coupling. For certain parameter ranges the model contains a regular solution that we interpret as a wormhole in an otherwise de Sitter Universe. We put several bounds on the parameter values: ω < 0, α2/|ω| < 10-5, 22.7 ≲ φ0 ≲ 25. The numerical solution could mimic the Schwarzschild one, so the original model is consistent with astrophysical and cosmological observational data. However, differences between our solution and the Schwarzschild one can be quite large, so black hole candidate observations could probably place further limits on the φ0 value. © 2015 IOP Publishing Ltd.
Keywords: BRANS-DICKE
COSMOLOGY
NAKED SINGULARITIES
NUMERICAL SOLUTION
WORMHOLES
URI: http://hdl.handle.net/10995/102358
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84941012630
PURE ID: 291446
9f406106-357a-4c83-91dd-3a06f1d6b63f
ISSN: 2649381
DOI: 10.1088/0264-9381/32/18/185002
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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