Dark Interactions and Cosmological Fine-Tuning

Abstract

Cosmological models involving an interaction between dark matter and dark energy have been proposed in order to solve the so-called coincidence problem. Different forms of coupling have been studied, but there have been claims that observational data seem to narrow (some of) them down to something annoyingly close to the $\Lambda$CDM model, thus greatly reducing their ability to deal with the problem in the first place. The smallness problem of the initial energy density of dark energy has also been a target of cosmological models in recent years. Making use of a moderately general coupling scheme, this paper aims to unite these different approaches and shed some light as to whether this class of models has any true perspective in suppressing the aforementioned issues that plague our current understanding of the universe, in a quantitative and unambiguous way.

13 pages, 9 figures, accepted for publication in JCAP. Minor corrections, one figure replaced, references added

References in corpus (1)

• Cosmological coincidence problem in interacting dark energy models

Cited by in corpus (12)

• Large-scale instability in interacting dark energy and dark matter fluids
• Dynamics of interacting dark energy
• Stability of the curvature perturbation in dark sectors' mutual interacting models
• The Growth of Structure in Interacting Dark Energy Models
• On the large-scale instability in interacting dark energy and dark matter fluids
• A Field Theory Model for Dark Matter and Dark Energy in Interaction
• Can Dark Matter Decay in Dark Energy?
• Late universe dynamics with scale-independent linear couplings in the dark sector
• Relaxing a large cosmological constant
• Crossing the phantom divide line in the Holographic dark energy model in a closed universe
• Holographic dark energy interacting with dark matter in a Closed Universe
• Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction