On extended sign-changeable interactions in the dark sector

Abstract

We extend the cosmological couplings proposed in Sun et al. and Wei, where they suggested interactions with change of signs along the cosmological evolution. Our extension liberates the changes of sign of the interaction from the deceleration parameter and from the relation of energy densities of the dark sector and considers the presence of non interactive matter. In three cases we obtain the general solutions and the results obtained in models fitted with Hubble's function and SNe Ia data, are analyzed regarding the problem of the cosmological coincidence, the problem of the crisis of the cosmological age and the magnitude of the energy density of dark energy at early universe. Also we graphically study the range of variation of, the actual dark matter density parameter, the effective equation of state of the dark energy and the redshift of transition to the accelerated regimen, generated by variations at order $1\sigma$ in the coupling parameters.

20 pages, 26 figures,title shortened, new references added, to be published in General Relativity and Gravitation journal. The final publication will be available at Springer via link.springer.com/article/10.1007/s10714-014-1811-2

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Cited by in corpus (14)

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• Observational constraints on sign-changeable interaction models and alleviation of the $H_0$ tension
• Cosmological constraints on coupled dark energy
• Probing the sign-changeable interaction between dark energy and dark matter with DESI baryon acoustic oscillations and DES supernovae data
• Constraining the dark energy models with H(z) data: an approach independent of $H_0$
• An Axially Symmetric Transitioning models with Observational Constraints
• Constraining the Asymptotically Safe Cosmology: cosmic acceleration without dark energy
• Probing the sign-changeable interaction between dark energy and dark matter with current observations
• On sign-changeable interaction in FLRW cosmology
• I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• Thermodynamics of interacting holographic dark energy
• Kinematic equivalence between models driven by DBI field with constant $\gamma$ and exotic holographic quintessence cosmological models
• An exotic k-essence interpretation of interactive cosmological models