Dark coupling and gauge invariance

Dark coupling and gauge invariance

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Dark coupling and gauge invariance

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Gavela, María Belén; López Honórez, Laura; Mena Requejo, Olga; Rigolin, Stefano
This document is a artículoDate2010

Este documento está disponible también en : http://hdl.handle.net/10550/37723
We study a coupled dark energy-dark matter model in which the energy-momentum exchange is proportional to the Hubble expansion rate. The inclusion of its perturbation is required by gauge invariance. We derive the linear perturbation equations for the gauge invariant energy density contrast and velocity of the coupled fluids, and we determine the initial conditions. The latter turn out to be adiabatic for dark energy, when assuming adiabatic initial conditions for all the standard fluids. We perform a full Monte Carlo Markov Chain likelihood analysis of the model, using WMAP 7-year data.

    Gavela, M. B. López Honórez, L. Mena Requejo, Olga Rigolin, S. 2010 Dark coupling and gauge invariance Journal Of Cosmology And Astroparticle Physics 10 11 044

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