Dark coupling
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Gavela, María Belén; Hernández Díaz, Daniel; López Honórez, Laura; Mena Requejo, Olga; Rigolin, Stefano
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Aquest document és un/a article, creat/da en: 2009
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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. |
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