A model for dark energy decay

Abstract

We discuss a model of non perturbative decay of dark energy. We suggest the possibility that this model can provide a mechanism from the field theory to realize the energy transfer from dark energy into dark matter, which is the requirement to alleviate the coincidence problem. The advantage of the model is the fact that it accommodates a mean life compatible with the age of the universe. We also argue that supersymmetry is a natural set up, though not essential.

Dark matter and dark energy interactions: theoretical challenges, cosmological implications and observational signatures

“…The cosmological constant can be interpreted as the energy density of the vacuum. At the Planck scale, the contribution to the quantum vacuum of the ground state of all known matter fields is ρ vac = 10 74 (GeV ) 4 , 121 orders of magnitude larger [403]. Therefore, the initial conditions for the concordance model requires setting a value of ρ Λ that is several orders of magnitude smaller than the theoretical expectation.…”

“…If we set the cosmological constant to zero in eqs. (3,4), it can be reintroduced as a fluid with energy density ρ Λ = Λ/(8πG) and an EoS parameter ω Λ = −1. In addition to the cosmological constant and the curvature terms the concordance model includes other energy density components: Baryons (b), Cold DM (c), and Radiation (r), characterized by the EoS parameters ω b = ω c = 0 and ω r = 1/3, respectively.…”

“…Table 2 shows that today Ω Λ ∼ 1 which implies that Λ ∼ 3H 2 0 . The corresponding energy density is a constant of amplitude ρ Λ = 10 −47 (GeV ) 4 . The cosmological constant can be interpreted as the energy density of the vacuum.…”

On detecting interactions in the dark sector withH(z)data

“…Later on, Wetterich [5], Micheletti, Abdalla, and Wang [6], Polyakov [7], and Abdalla, Graef, and Wang [8], among others, reinforced the theoretical framework. As we write, the number of proposals (both from the theoretical as well as from the phenomenological side) has been greatly augmented -see e.g.…”

Early dark energy and its interaction with dark matter

“…Since we know the nature of neither DM nor DE, it is hard to describe the interaction between them, although there are some attempts on this task [27][28][29][30]. Our study on the interaction between dark sectors will concentrate on the phenomenological descriptions.…”