2009/01/12 by M. B. Gavela, M.B. Gavela, Daniel E. Hernández +6 · 3 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2009/07/034
published as JCAP 0907:034,2009; Erratum-ibid.1005:E01,2010 · 30 pages, 10 figures
arxiv created 2009/01/12 · openalex publication_date 2009/07/23 · arxiv updated 2010/05/25 · openalex created_date 2020/07/02 · openalex updated_date 2026/08/01
The two dark sectors of the universe—dark matter and dark energy—may interact with each other. Background and linear density perturbation evolution equations are developed for a generic coupling. We then establish the general conditions necessary to obtain models free from non-adiabatic instabilities. As an application, we consider a viable universe in which the interaction strength is proportional to the dark energy density. The scenario does not exhibit ``phantom crossing'' and is free from instabilities, including early ones. A sizeable interaction strength is compatible with combined WMAP, HST, SN, LSS and H ( z ) data. Neutrino mass and/or cosmic curvature are allowed to be larger than in non-interacting models. Our analysis sheds light as well on unstable scenarios previously proposed.