Dark Coupling and Gauge Invariance

Details Dark Coupling and Gauge Invariance Dark Coupling and Gauge Invariance

2010-05-03

arxiv.org/abs/1005.0295v2

JCAP 1011:044,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 2 figures, version accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2010/11/044

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.

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