More on the holographic Ricci dark energy model: smoothing Rips through interaction effects?

Abstract

The background cosmological dynamics of the late Universe is analysed on the framework of a dark energy model described by an holographic Ricci dark energy component. Several kind of interactions between the dark energy and the dark matter components are considered herein. We solve the background cosmological dynamics for the different choices of interactions with the aim to analyse not only the current evolution of the universe but also its asymptotic behaviour and, in particular, possible future singularities removal. We show that in most of the cases, the Big Rip singularity, a finger print of this model in absence of an interaction between the dark sectors, is substituted by a de Sitter or a Minkowski state. Most importantly, we found two new {\textit{ future}} bouncing solutions leading to two possible asymptotic behaviours, we named Little Bang and Little Sibling of the Big Bang. At a Little Bang, as the size of the universe shrinks to zero in an infinite cosmic time, the Hubble rate and its cosmic time derivative blow up. In addition, at a Little sibling of the Big Bang, as the size of the universe shrinks to zero in an infinite cosmic time, the Hubble rate blows up but its cosmic time derivative is finite. These two abrupt events can happen as well in the past.

10 pages, Shortened and improved version

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Cited by in corpus (10)

• Barrow entropic dark energy: A member of generalized holographic dark energy family
• Exploring neutrino mass and mass hierarchy in interacting dark energy models
• Recent advances in cosmological singularities
• Cosmological constraints on dynamical dark energy model in $F(Q)$ gravity
• Constraints on Power Law and Exponential models in $f(Q)$ Gravity
• An interacting holographic dark energy model within an induced gravity brane
• Holographic Dark Energy from Acceleration of Particle Horizon
• Observational constraints on the growth index parameters in $f(Q)$ gravity
• Exploring the cosmic censorship conjecture with a Gauss-Bonnet sector
• Diagnostic Approaches for Interacting generalized holographic Ricci Dark Energy Models