2009/01/31 by Yuri Shtanov, Varun Sahni, Arman Shafieloo +2 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2009/04/023
published as JCAP 04 (2009) 023 · 17 pages, 4 figures. New results and two figures discussing transient acceleration are included. Version accepted for publication in JCAP
arxiv created 2009/04/06 · openalex publication_date 2009/04/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We investigate the cosmological properties of an `induced gravity' brane scenario in the absence of mirror symmetry with respect to the brane. We find that brane evolution can proceed along one of four distinct branches. By contrast, when mirror symmetry is imposed, only two branches exist, one of which represents the self-accelerating brane, while the other is the so-called normal branch. This model incorporates many of the well-known possibilities of brane cosmology including phantom acceleration ( w < −1), self-acceleration, transient acceleration, quiescent singularities, and cosmic mimicry. Significantly, the absence of mirror symmetry also provides an interesting way of inducing a sufficiently small cosmological constant on the brane. A small (positive) Λ-term in this case is induced by a small asymmetry in the values of bulk fundamental constants on the two sides of the brane.