Running coupling: Does the coupling between dark energy and dark matter change sign during the cosmological evolution?

Abstract

In this paper we put forward a running coupling scenario for describing the interaction between dark energy and dark matter. The dark sector interaction in our scenario is free of the assumption that the interaction term $Q$ is proportional to the Hubble expansion rate and the energy densities of dark sectors. We only use a time-variable coupling $b(a)$ (with $a$ the scale factor of the universe) to characterize the interaction $Q$. We propose a parametrization form for the running coupling $b(a)=b_{0}a+b_e(1-a)$ in which the early-time coupling is given by a constant $b_e$, while today the coupling is given by another constant, $b_0$. For investigating the feature of the running coupling, we employ three dark energy models, namely, the cosmological constant model ($w=-1$), the constant $w$ model ($w=w_0$), and the time-dependent $w$ model ($w(a)=w_0+w_1(1-a)$). We constrain the models with the current observational data, including the type Ia supernova, the baryon acoustic oscillation, the cosmic microwave background, the Hubble expansion rate, and the X-ray gas mass fraction data. The fitting results indicate that a time-varying vacuum scenario is favored, in which the coupling $b(z)$ crosses the noninteracting line ($b=0$) during the cosmological evolution and the sign changes from negative to positive. The crossing of the noninteracting line happens at around $z=0.2-0.3$, and the crossing behavior is favored at about 1$\sigma$ confidence level. Our work implies that we should pay more attention to the time-varying vacuum model and seriously consider the phenomenological construction of a sign-changeable or oscillatory interaction between dark sectors.

8 pages, 5 figures; refs added; to appear in EPJC

References in corpus (22)

• Dynamics of dark energy
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Dark Energy and the Accelerating Universe
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Dynamics of dark energy with a coupling to dark matter
• Effects of the interaction between dark energy and dark matter on cosmological parameters
• Interacting Agegraphic Dark Energy
• Thermodynamical description of the interaction between holographic dark energy and dark matter
• Statefinder diagnosis for the interacting model of holographic dark energy
• Probing the dynamics of dark energy with novel parametrizations
• Coupled dark matter-dark energy in light of near Universe observations
• The imprint of the interaction between dark sectors in large scale cosmic microwave background anisotropies
• Some Issues Concerning Holographic Dark Energy
• Effects of dark sectors' mutual interaction on the growth of structures
• Dynamics of interacting dark energy model in Einstein and Loop Quantum Cosmology
• A model of interacting holographic dark energy at the Ricci's scale
• Alleviation of Cosmic Age Problem In Interacting Dark Energy Model
• Interacting model of new agegraphic dark energy: observational constraints and age problem
• Cosmic age problem revisited in the holographic dark energy model
• Multiple Lambda cosmology: dark fluid with time-dependent equation of state as classical analog of cosmological landscape
• Cosmic age, Statefinder and $Om$ diagnostics in the decaying vacuum cosmology
• The Integrated Sachs-Wolfe Effect in Time Varying Vacuum Model

Cited by in corpus (51)

• Interacting Dark Energy -- constraints and degeneracies
• Constraints on Interacting Dark Energy Models from the DESI Baryon Acoustic Oscillation and DES Supernovae Data
• Cosmological constraints on interacting dark energy with redshift-space distortion after Planck data
• Hubble expansion and structure formation in the "running FLRW model" of the cosmic evolution
• Large-scale stable interacting dark energy model: Cosmological perturbations and observational constraints
• Dark sectors with dynamical coupling
• Exploring the full parameter space for an interacting dark energy model with recent observations including redshift-space distortions: Application of the parametrized post-Friedmann approach
• Testing models of vacuum energy interacting with cold dark matter
• Model-independent reconstruction of the Interacting Dark Energy Kernel: Binned and Gaussian process
• Prospects for Constraining Interacting Dark Energy Models with 21 cm Intensity Mapping Experiments
• Weighing neutrinos in the scenario of vacuum energy interacting with cold dark matter: application of the parameterized post-Friedmann approach
• Holographic dark energy in a universe with spatial curvature and massive neutrinos: a full Markov Chain Monte Carlo exploration
• Exploring neutrino mass and mass hierarchy in the scenario of vacuum energy interacting with cold dark matter
• Constraints on interacting dark energy models from time-delay cosmography with seven lensed quasars
• Holographic Ricci dark energy: Interacting model and cosmological constraints
• Constraints on active and sterile neutrinos in an interacting dark energy cosmology
• Probing the sign-changeable interaction between dark energy and dark matter with DESI baryon acoustic oscillations and DES supernovae data
• Search for sterile neutrinos in a universe of vacuum energy interacting with cold dark matter
• Effects of time-varying $\beta$ in SNLS3 on constraining interacting dark energy models
• On the dynamics of a dark sector coupling
• Using a multi-messenger and multi-wavelength observational strategy to probe the nature of dark energy through direct measurements of cosmic expansion history
• Impacts of gravitational-wave standard siren observations from Einstein Telescope and Cosmic Explorer on weighing neutrinos in interacting dark energy models
• Quantifying the impacts of future gravitational-wave data on constraining interacting dark energy
• Exploring neutrino mass and mass hierarchy in interacting dark energy models
• Probing the sign-changeable interaction between dark energy and dark matter with current observations
• Revisiting the holographic dark energy in a non-flat universe: alternative model and cosmological parameter constraints
• Models of vacuum energy interacting with cold dark matter: Constraints and comparison
• Cosmological implications of an interacting model of dark matter \& dark energy
• Exploring interacting holographic dark energy in a perturbed universe with parameterized post-Friedmann approach
• Interacting Ricci-like holographic dark energy
• Probing the interaction between dark energy and dark matter with future fast radio burst observations
• Constraints on neutrino mass in the scenario of vacuum energy interacting with cold dark matter after Planck 2018
• Reexploration of interacting holographic dark energy model: Cases of interaction term excluding the Hubble parameter
• Interacting modified holographic Ricci dark energy model and statefinder diagnosis in flat universe
• IDECAMB: an implementation of interacting dark energy cosmology in CAMB
• Cosmic sign-reversal: non-parametric reconstruction of interacting dark energy with DESI DR2
• Dark energy versus modified gravity: Impacts on measuring neutrino mass
• On sign-changeable interaction in FLRW cosmology
• Effects of a time-varying color-luminosity parameter $\beta$ on the cosmological constraints of modified gravity models
• In search of an interaction in the dark sector through Gaussian Process and ANN approaches
• Interacting holographic Ricci dark energy as running vacuum
• Cosmological evolution of quintessence with a sign-changing interaction in dark sector
• Holographic Λ(t)CDM model in a non-flat universe
• New observational constraints on interacting dark energy using galaxy clusters virial equilibrium states
• The accelerated scaling attractor solution of the interacting agegraphic dark energy in Brans-Dicke theory
• Interacting parametrized post-Friedmann method
• Reconstruction of the interaction term between dark matter and dark energy using SNe Ia
• Thermodynamics of interacting holographic dark energy
• Dark Energy in the DESI Era: A Brief Review of Evidence, Beyond-$\Lambda$CDM Interpretations, and Tensions
• Reconstruction of the interaction term between dark matter and dark energy using SNe Ia, BAO, CMB, H(z) and X-ray gas mass fraction
• Agegraphic dark energy with the sign-changeable interaction in non-flat universe