Can dark matter-dark energy interaction alleviate the Cosmic Coincidence Problem?

Abstract

In this paper we study a model of interacting dark energy - dark matter where the ratio between these components is not constant, changing from early to late times in such a way that the model can solve or alleviate the cosmic coincidence problem (CP). The interaction arises from an assumed relation of the form ${\rho }_x\propto {\rho }_d^{\alpha }$, where ${\rho }_x$ and ${\rho }_d$ are the energy densities of dark energy and dark matter components, respectively, and $\alpha$ is a free parameter. For a dark energy equation of state parameter $w=-1$ we found that, if $\alpha =0$, the standard $\Lambda$CDM model is recovered, where the coincidence problem is unsolved. For $0<\alpha <1$, the CP would be alleviated and for $\alpha \sim 1$, the CP would be solved. The dark energy component is analyzed with both $w=-1$ and $w\ne -1$. Using Supernovae type Ia and Hubble parameter data constraints, in the case $w=-1$ we find $\alpha =0.109_{-0.072}^{+0.062}$ at 68% C.L., and the CP is alleviated. For $w\ne -1$, a degeneracy arises on the $w$ - $\alpha$ plane. In order to break such degeneracy we add cosmic microwave background distance priors and baryonic acoustic oscillations data to the constraints, yielding $\alpha =-0.075\pm 0.046$ at 68% C.L.. In this case we find that the CP is not alleviated even for 2$\sigma$ interval for $\alpha$. Furthermore, this last model is discarded against flat $\Lambda$CDM according to BIC analysis.

arXiv comment22 pages, 6 figures, revised version, with Bayesian Information Criterion (BIC) analysis included. Version published

References in corpus (35)

• emcee: The MCMC Hammer
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Temperature of the Cosmic Microwave Background
• Beyond $\Lambda$CDM: Problems, solutions, and the road ahead
• Dynamical dark energy in light of the latest observations
• How many cosmological parameters?
• Large-scale instability in interacting dark energy and dark matter fluids
• Indications of a late-time interaction in the dark sector
• Aspects of the cosmological "coincidence problem"
• Super-acceleration as Signature of Dark Sector Interaction
• Distance Priors from Planck Final Release
• Linear and nonlinear interactions in the dark sector
• Stability of the curvature perturbation in dark sectors' mutual interacting models
• Observational constraints on an interacting dark energy model
• Update on Coupled Dark Energy and the $H_0$ tension
• Models of coupled dark matter to dark energy
• The Cardassian expansion revisited: constraints from updated Hubble parameter measurements and Type Ia Supernovae data
• The Growth of Structure in Interacting Dark Energy Models
• Interacting Quintessence, Cosmic Acceleration and the Coincidence Problem
• The Parameterized Post-Friedmannian Framework for Interacting Dark Energy Theories
• Adiabatic initial conditions for perturbations in interacting dark energy models
• On the Dark Sector Interactions
• 2021-$H_0$ Odyssey: Closed, Phantom and Interacting Dark Energy Cosmologies
• Large-scale stable interacting dark energy model: Cosmological perturbations and observational constraints
• Dark sector interaction and the supernova absolute magnitude tension
• The impact of the cosmic variance on $H_0$ on cosmological analyses
• Can Dark Matter Decay in Dark Energy?
• Dark degeneracy I: Dynamical or interacting dark energy?
• Metastable Dark Energy with Radioactive-like Decay
• New Interaction between Dark Energy and Dark Matter Changes Sign during Cosmological Evolution
• Metastable dark energy models in light of Planck 2018: Alleviating the $H_0$ tension
• The evolution of the FRW universe with decaying metastable dark energy --- a dynamical system analysis
• Bayesian analysis of CCDM Models

Cited by in corpus (4)

• IWDM: The fate of an interacting non-cold dark matter $-$ vacuum scenario
• Interacting dark sector: a dynamical system perspective
• Non-Parametric Analysis for the Dark Matter Density Evolution
• Vainshtein screening in Horndeski theories nonminimally and kinetically coupled to ordinary matter