The effect of Dark Matter and Dark Energy interactions on the peculiar velocity field and the kinetic Sunyaev-Zel'dovich effect

Abstract

The interaction between Dark Matter and Dark Energy has been proposed as a mechanism to alleviate the coincidence problem. We analyze the effect of the interaction on the evolution of the gravitational field and propose two new observables based on its effect on the matter peculiar velocity field. We find that for different model parameters the matter peculiar velocity could be factor 2 times larger or 5 times smaller than the amplitude of velocity perturbations in the concordance LCDM cosmological model at the same scales. We compare the effect on the peculiar velocities with those on the Integrated Sachs-Wolfe effect and we show that velocities can potentially provide constraints on the strength of the interaction stronger than those currently available. We show that the current upper limits on the amplitude of the kinetic Sunyaev-Zel'dovich power spectrum provide constraints on the coupling within the dark sectors that are consistent with those obtained previously from the CMB and galaxy clusters. In particular, we show that current upper limits from the Atacama Cosmology Telescope and the South Pole Telescope favor Dark Energy decaying into Dark Matter, as required to solve the coincidence problem.

23 pages, 7 figures, accepted for publication in JCAP

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• Disformal couplings and the dark sector of the universe
• Testing models of vacuum energy interacting with cold dark matter
• Covariantizing the interaction between dark energy and dark matter
• Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
• Search for sterile neutrinos in a universe of vacuum energy interacting with cold dark matter
• Impacts of gravitational-wave standard siren observations from Einstein Telescope and Cosmic Explorer on weighing neutrinos in interacting dark energy models
• Quantifying the impacts of future gravitational-wave data on constraining interacting dark energy
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• Models of vacuum energy interacting with cold dark matter: Constraints and comparison
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• Thermodynamical description of the ghost dark energy model
• Extracting the late-time kinetic Sunyaev-Zel'dovich effect
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
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• Thermodynamics of Shearing Massless Scalar Field Spacetimes is Inconsistent With the Weyl Curvature Hypothesis
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• Reconstructing the Thermal Sunyaev-Zel'dovich Effect in 3D
• Holographic energy density on Hořava-Lifshitz cosmology
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