Maeda, Hideki ; Sahni, Varun ; Shtanov, Yuri (2007) Braneworld dynamics in Einstein-Gauss-Bonnet gravity Physical Review D - Particles, Fields, Gravitation and Cosmology, 76 (10). 104028_1-104028_11. ISSN 1550-7998
Full text not available from this repository.
Official URL: http://prd.aps.org/abstract/PRD/v76/i10/e104028
Related URL: http://dx.doi.org/10.1103/PhysRevD.76.104028
Abstract
We discuss the cosmological evolution of a braneworld in five-dimensional Gauss-Bonnet gravity. Our discussion allows the fifth (bulk) dimension to be spacelike as well as timelike. The resulting equations of motion have the form of a cubic equation in the (H2,(ρ+σ)2) plane, where s is the brane tension and ρ is the matter density. This allows us to conduct a comprehensive pictorial analysis of cosmological evolution for the Gauss-Bonnet brane. The many interesting properties of this braneworld include the possibility of accelerated expansion at late times. For a finite region in parameter space the accelerated expansion can be phantomlike so that w<−1. At late times, this branch approaches de Sitter space (w=−1) and avoids the big-rip singularities usually present in phantom models. For a timelike extra dimension the Gauss-Bonnet brane can bounce and avoid the initial singularity.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 45606 |
Deposited On: | 28 Jun 2011 04:40 |
Last Modified: | 28 Jun 2011 04:40 |
Repository Staff Only: item control page