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Dark Coupling and Gauge Invariance
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Dark Coupling and Gauge Invariance
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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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Cited by 1 Pith paper
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A microphysically inspired approach to dark matter-dark energy interactions: first bounds on dark-sector scattering cross sections
A microphysically motivated Q∝ρ² dark-sector interaction is constrained by cosmological data, giving upper limits A<7.6×10⁻²⁵, B<0.048, and H₀=67.71±0.65 km/s/Mpc.
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