Dark coupling

Dark coupling

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Dark coupling

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Gavela, María Belén; Hernández Díaz, Daniel; López Honórez, Laura; Mena Requejo, Olga; Rigolin, Stefano
This document is a artículoDate2009

Este documento está disponible también en : http://hdl.handle.net/10550/37736
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.

    Gavela, M. B. Hernández, D. López Honórez, Laura Mena Requejo, Olga Rigolin, S. 2009 Dark coupling Journal Of Cosmology And Astroparticle Physics 2009 7 034

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