Probing the imprints of generalized interacting dark energy on the growth of perturbations

Abstract

We extensively study the evolution and distinct signatures of cosmological models, in which dark energy interacts directly with dark matter. We first focus on the imprints of these coupled models on the cosmic microwave background temperature power spectrum, in which we discuss the multipole peak separation together with the integrated Sachs-Wolfe effect. We also address the growth of matter perturbations, and disentangle the interacting dark energy models using the expansion history together with the growth history. We find that a disformal coupling between dark matter and dark energy induces intermediate-scales and time-dependent damped oscillatory features in the matter growth rate function, a unique characteristic of this coupling. Apart from the disformal coupling, we also consider conformally coupled models, together with models which simultaneously make use of both couplings.

31 pages, 13 figures

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• Theoretical and observational bounds on some interacting vacuum energy scenarios
• IWDM: The fate of an interacting non-cold dark matter $-$ vacuum scenario
• Scalar field dark matter and dark energy: a hybrid model for the dark sector
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• I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• Potential-driven Inflation with Disformal Coupling to Gravity
• Is Dark Energy Changing? Probing the Universe's Expansion with present and future astronomical probes
• New tests of dark sector interactions from the full-shape galaxy power spectrum
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