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|Authors:||Gavela, Mª Belén|
López Honorez, L.
|Keywords:||Dark energy theory, Cosmological perturbation theory, Cosmology of theories beyond the SM|
|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|
|Appears in Collections:||(IFIC) Artículos|
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