Consequences of dark matter-dark energy interaction on cosmological parameters derived from SNIa data

Abstract

Models where the dark matter component of the universe interacts with the dark energy field have been proposed as a solution to the cosmic coincidence problem, since in the attractor regime both dark energy and dark matter scale in the same way. In these models the mass of the cold dark matter particles is a function of the dark energy field responsible for the present acceleration of the universe, and different scenarios can be parameterized by how the mass of the cold dark matter particles evolves with time. In this article we study the impact of a constant coupling $\delta$ between dark energy and dark matter on the determination of a redshift dependent dark energy equation of state $w_{DE}(z)$ and on the dark matter density today from SNIa data. We derive an analytical expression for the luminosity distance in this case. In particular, we show that the presence of such a coupling increases the tension between the cosmic microwave background data from the analysis of the shift parameter in models with constant $w_{DE}$ and SNIa data for realistic values of the present dark matter density fraction. Thus, an independent measurement of the present dark matter density can place constraints on models with interacting dark energy.

16 pages, 6 figures. Incorporates analysis using the CMB shift parameter

References in corpus (3)

• Dynamics of dark energy
• Observational constraints on self-accelerating cosmology
• Confronting quintessence models with recent high-redshift supernovae data

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• The Cosmological Dynamics of Interacting Holographic Dark Energy Model
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• A Field Theory Model for Dark Matter and Dark Energy in Interaction
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• Cosmological model with interactions in the dark sector
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• Unified model of baryonic matter and dark components
• Reconstruction of interacting dark energy models from parameterizations
• Dark-Energy Dynamics Required to Solve the Cosmic Coincidence
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• Dark Energy-Dark Matter Interaction from the Abell Cluster A586
• Statefinder parameters for quantum effective Yang-Mills condensate dark energy model
• Structure and evolution of Zel'dovich pancakes as probes of dark energy models
• Comments on Scalar-Tensor Representation of $f(R)$ Theories
• Perturbed dark energy: classical scalar field versus tachyon
• Realistic Equations of State for the Primeval Universe
• Equilibrium boundary conditions, dynamic vacuum energy, and the Big Bang
• Cosmic Acceleration Data and Bulk-Brane Energy Exchange
• Thermodynamical picture of the interacting holographic dark energy model