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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/20358
Title: 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
URI: http://hdl.handle.net/10261/20358
ISSN: 1475-7516 (Online)
DOI: 10.1088/1475-7516/2009/07/034
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