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Open Access item Dark coupling

Authors:Gavela, Mª Belén
Hernández, D.
López Honorez, L.
Mena, Olga
Rigolin, S.
Keywords:Dark energy theory, Cosmological perturbation theory, Cosmology of theories beyond the SM
Issue Date:Jul-2009
Publisher:Institute of Physics Publishing
International School for Advanced Studies
Citation:Journal of Cosmology and Astroparticle Physics 07(034): (2009)
Abstract: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.
Description:30 pages, 10 figures, 3 tables.-- Pre-print archive.
Publisher version (URL):http://dx.doi.org/10.1088/1475-7516/2009/07/034
ISSN:1475-7516 (Online)
Appears in Collections:(IFIC) Artículos

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