Interacting models may be key to solve the cosmic coincidence problem

Abstract

It is argued that cosmological models that feature a flow of energy from dark energy to dark matter may solve the coincidence problem of late acceleration (i.e., "why the energy densities of both components are of the same order precisely today?"). However, much refined and abundant observational data of the redshift evolution of the Hubble factor are needed to ascertain whether they can do the job.

25 pages, 11 figures; accepted for publication in JCAP

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• Challenges for $\Lambda$CDM: An update
• Non-minimal dark sector physics and cosmological tensions
• Interacting dark energy in the early 2020s: a promising solution to the $H_0$ and cosmic shear tensions
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• Dark coupling
• Interacting dark energy with time varying equation of state and the $H_0$ tension
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• Novel approach towards the large-scale stable Interacting Dark-Energy models and their Astronomical Bounds
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• Looking for interactions in the cosmological dark sector
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• New Interaction between Dark Energy and Dark Matter Changes Sign during Cosmological Evolution
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