The integrated Sachs-Wolfe effect in cosmologies with coupled dark matter and dark energy

Abstract

The subject of this paper is the derivation of the integrated Sachs-Wolfe (iSW) effect in cosmologies with coupled dark matter and dark energy fluids. These couplings influence the iSW-effect in three ways: The Hubble function assumes a different scaling, the structure growth rate shows a different time evolution, and in addition, the Poisson equation, which relates the density perturbations to fluctuations in the gravitational potential, is changed, due to the violation of the scaling rho ~ a^{-3} of the matter density rho with scale factor a. Exemplarily, I derive the iSW-spectra for a model in which dark matter decays into dark energy, investigate the influence of the dark matter decay rate and the dark energy equation of state on the iSW-signal, and discuss the analogies for gravitational lensing. Quite generally iSW-measurements should reach similar accuracy in determining the dark energy equation of state parameter and the coupling constant.

5 pages, 4 figures, 1 table, submitted to MNRAS

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• Interacting models may be key to solve the cosmic coincidence problem
• Adiabatic initial conditions for perturbations in interacting dark energy models
• The imprint of the interaction between dark sectors in large scale cosmic microwave background anisotropies
• A New Class of Parametrization for Dark Energy without Divergence
• Transient cosmic acceleration from interacting fluids
• Constraints on the dark matter and dark energy interactions from weak lensing bispectrum tomography
• Dark Matter-Dark Energy Interaction and the Shape of Cosmic Voids
• The late Universe with non-linear interaction in the dark sector: the coincidence problem
• The Integrated Sachs-Wolfe Effect in Interacting Dark Matter-Dark Energy Models
• The Integrated Sachs-Wolfe Effect in 4D Einstein-Gauss-Bonnet Gravity
• CMB Cold Spot in the Planck light
• ISW-LSS cross-correlation in coupled Dark Energy models with massive neutrinos
• Structure Formation in Various Dynamical Dark Energy Scenarios
• The Integrated Sachs-Wolfe Effect in the Bulk Viscous Dark Energy Model
• Voids and overdensities of coupled Dark Energy
• Probing Ricci dark energy model with perturbations by using WMAP seven-year cosmic microwave background measurements, BAO and Type Ia supernovae
• Reconstruction of the interaction term between dark matter and dark energy using SNe Ia
• Reconstruction of the interaction term between dark matter and dark energy using SNe Ia, BAO, CMB, H(z) and X-ray gas mass fraction
• Integrated Sachs-Wolfe maps from the Gower Street $w$CDM simulations
• Constraining Quintessence Models with ISW-tSZ Cross-Correlations: A Comparative Analysis of Thawing, Tracker, and Scaling-Freezing Dynamics