2006/09/14 by C. Bogdanos, K. Tamvakis · 38 citations
Physics and Astronomy · #Ansatz #Black Holes and Theoretical Physics #Brane #Brane cosmology #Cosmology #Cosmology and Gravitation Theories #Dark energy #Energy density #Equation of state #Friedmann equations #Galaxies: Formation, Evolution, Phenomena #Mathematical physics #Physics #Quantum mechanics #Theoretical physics #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · open access · doi:10.1016/j.physletb.2007.01.009
published in Physics Letters B 646(1), 39-46 (Elsevier BV) · 11 Pages
arxiv created 2006/09/14 · openalex publication_date 2007/01/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider the cosmological evolution of a brane for general bulk matter content. In our setup the bulk pressure and the energy exchange densities are comparable to the brane energy density. Adopting a phenomenological fluid ansatz and generalizations of it, we derive a set of exact solutions of the Friedmann equation that exhibit accelerated expansion. We find that the effective equation of state parameter for the dark energy can exhibit w = − 1 crossing without the presence of exotic matter.