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Open Access item Dark coupling and gauge invariance

Authors:Gavela, Mª Belén
López Honorez, L.
Mena, Olga
Rigolin, S.
Issue Date:Nov-2010
Publisher:Institute of Physics Publishing
Citation:Journal of Cosmology and Astroparticle Physics (JCAP) 11: 044 (2010)
Abstract:We study a coupled dark energy–dark matter model in which the energymomentum 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.
Publisher version (URL):http://dx.doi.org/10.1088/1475-7516/2010/11/044
URI:http://hdl.handle.net/10261/33078
ISSN:1475-7516
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