2004/06/30 by Antonio Padilla · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1088/0264-9381/22/4/003
published as Class.Quant.Grav. 22 (2005) 681-694 · Version appearing in CQG
openalex publication_date 2005/01/25 · arxiv created 2005/02/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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.