Year: 2005
Type: article
Abstract: We consider a single 3-brane sitting in between two different five-dimensional spacetimes. On each side of the brane, the bulk is a solution to Gauss–Bonnet gravity, although the bare cosmological constant, fundamental Planck scale and Gauss–Bonnet coupling can differ. This asymmetry leads to weighted junction conditions across the brane and interesting brane cosmology. We focus on two special cases: a generalized Randall–Sundrum model without any Gauss–Bonnet terms, and a stringy model, without any bare cosmological constants, and positive Gauss–Bonnet coupling. Even though we assume there is no vacuum energy on the brane, we find late time de Sitter cosmologies can occur. Remarkably, in certain parameter regions, this acceleration is preceded by a period of matter/radiation domination, with H 2 ∝ ρ, all the way back to nucleosynthesis.
Source: Classical and Quantum Gravity
Author: Antonio Padilla
Institution: University of Oxford
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2059107362