Brans-Dicke Scalar Field as a Unique k-essence

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dc.creatorKim, Hongsu
dc.date2004-08-09
dc.date2004-12-06
dc.date.accessioned2026-07-07T02:14:15Z
dc.date.available2026-07-07T02:14:15Z
dc.descriptionIn the present work, the Brans-Dicke theory of gravity is taken as a possible theory of k-essence coupled to gravity and then the role played by the Brans-Dicke scalar field in relation to the unified model for dark matter and dark energy is explored. It has been realized that the BD scalar field does indeed play a role of a k-essence, but in a very unique way which distinguishes it from other k-essence fields studied in the literature such as the (generalized) Chaplygin gas or the purely kinetic k-essence studied recently by Scherrer. That is, instead of providing an interpolation between the dark matter-like evolution and the dark energy-like evolution, the BD theory predicts the emergence of a yet-unknown {\it zero acceleration} epoch which is an intermediate stage acting as a ``crossing bridge'' between the decelerating matter-dominated era and the accelerating phase.
dc.description18 pages, Accepted for publication in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/astro-ph/0408154
dc.identifierhttp://arxiv.org/abs/astro-ph/0408154
dc.identifierPhys.Lett. B606 (2005) 223-233
dc.identifierdoi:10.1016/j.physletb.2004.12.003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8041
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleBrans-Dicke Scalar Field as a Unique k-essence
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