Brans-Dicke Theory as a Unified Model for Dark Matter - Dark Energy
| dc.creator | Kim, Hongsu | |
| dc.date | 2004-08-31 | |
| dc.date | 2005-09-09 | |
| dc.date.accessioned | 2026-07-07T06:23:17Z | |
| dc.date.available | 2026-07-07T06:23:17Z | |
| dc.description | The Brans-Dicke (BD) theory of gravity is taken as a possible theory of k-essence coupled to gravity. It then 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. That is, first in the BD scalar field-dominated era when the contribution from this k-essence overwhelms those from other types of matter, 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. Upon realizing this, next, closer study of the effects of this k-essence on the evolutionary behavior of the matter-dominated and the accelerating eras has been performed. The result of the study indicates that the BD scalar field appears to interpolate {\it smoothly} between these two late-time stages by speeding up the expansion rate of the matter-dominated era somewhat while slowing down that of the accelerating phase to some degree. Thus with the newly found BD scalar field-dominated era in between these two, the late-time of the universe evolution appears to be mixed sequence of the three stages. | |
| dc.description | 25 pages, Mon. Not. R. Astron. Soc.(MNRAS), in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0408577 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0408577 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc. 364 (2005) 813-822 | |
| dc.identifier | doi:10.1111/j.1365-2966.2005.09593.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/96177 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Brans-Dicke Theory as a Unified Model for Dark Matter - Dark Energy | |
| dc.type | text |