Could Dark Matter Interactions be an Alternative to Dark Energy ?

Abstract

We study the global dynamics of the universe within the framework of the Interacting Dark Matter (IDM) scenario. Assuming that the dark matter obeys the collisional Boltzmann equation, we can derive analytical solutions of the global density evolution, which can accommodate an accelerated expansion, equivalent to either the {\em quintessence} or the standard $\Lambda$ models, with the present time located after the inflection point. This is possible if there is a disequilibrium between the DM particle creation and annihilation processes with the former process dominating, which creates an effective source term with negative pressure. Comparing the predicted Hubble expansion of one of the IDM models (the simplest) with observational data we find that the effective annihilation term is quite small, as suggested by a variety of other recent experiments.

7 pages, 2 figures, Accepted for publication by Astronomy & Astrophysics, major revision

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Cited by in corpus (20)

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• Observational constraints on sign-changeable interaction models and alleviation of the $H_0$ tension
• New Cosmic Accelerating Scenario without Dark Energy
• Newtonian Perturbations on Models with Matter Creation
• Constraints on Exotic Matter for An Emergent Universe
• Metastable dark energy models in light of Planck 2018: Alleviating the $H_0$ tension
• Background evolution and growth of structures in interacting dark energy through dynamical system analysis
• Polytropic dark matter flows illuminate dark energy and accelerated expansion
• Observational Constraints on Interacting Dark Matter Model Without Dark Energy
• Dark energy and dark matter unification from dynamical space time: observational constraints and cosmological implications
• A conventional approach to the dark-energy concept
• Dark Energy: The Shadowy Reflection of Dark Matter?
• Constraints on dark energy models from radial baryon acoustic scale measurements
• Interacting dark energy after DESI DR2: a challenge for $\Lambda$CDM paradigm?
• Constraining H0 in General Dark Energy Models from Sunyaev-Zeldovich/X-ray Technique and Complementary Probes
• Discriminating among cosmological models by data-driven methods
• Thermodynamic analysis of universes with the initial and final de-Sitter eras
• Effective dark energy through spin-gravity coupling
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• Accelerating scaling solutions from dark matter particle creation