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Título

Dark coupling

AutorGavela, Mª Belén ; Hernández Díaz, Daniel; López Honórez, Laura ; Mena, Olga ; Rigolin, Stefano
Palabras claveDark energy theory
Cosmological perturbation theory
Cosmology of theories beyond the SM
Fecha de publicaciónjul-2009
EditorInstitute of Physics Publishing
International School for Advanced Studies
CitaciónJournal of Cosmology and Astroparticle Physics 07(034): (2009)
ResumenThe 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.
Descripción30 pages, 10 figures, 3 tables.-- Pre-print archive.
Versión del editorhttp://dx.doi.org/10.1088/1475-7516/2009/07/034
URIhttp://hdl.handle.net/10261/20358
DOI10.1088/1475-7516/2009/07/034
ISSN1475-7516 (Online)
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