Dark calling dark: interaction in the dark sector in presence of neutrino properties after Planck CMB final release

Abstract

We investigate a well known scenario of interaction in the dark sector, where the vacuum energy is interacting with cold dark matter throughout the cosmic evolution in light of the cosmic microwave background (CMB) data from final Planck 2018 release. In addition to this minimal scenario, we generalize the model baseline by including the properties of neutrinos, such as the neutrino mass scale (Mν ) and the effective number of neutrino species (N eff ) as free parameters, in order to verify the possible effects that such parameters might generate on the coupling parameter, and vice versa. As already known, we confirm that in light of Planck 2018 data, such dark coupling can successfully solve the H0 tension (with and without the presence of neutrinos). Concerning the properties of neutrinos, we find that Mν may be wider than expected within the ΛCDM model and N eff is fully compatible with three neutrino species (similar to ΛCDM prevision). The parameters characterizing the properties of neutrinos do not correlate with the coupling parameter of the interaction model. When considering the joint analysis of CMB from Planck 2018 and an estimate of H0 from Hubble Space Telescope 2019 data, we find an evidence for a non-null value of the coupling parameter at more than 3σ confidence-level. We discuss also the inclusion the baryon acoustic oscillations data in combination with Planck 2018 and implications for the scenarios addressed. Our main results updating the dark sectors' interaction and neutrino properties in the model baseline, represent a new perspective in this direction. Clearly, a possible new physics in light of some dark interaction between dark energy and dark matter can serve as an alternative to ΛCDM scenario to explain the observable Universe, mainly in light of the current tension on H0.

Rastall gravity extension of the standard $$\Lambda $$CDM model: theoretical features and observational constraints

“…Yet we have learned one another important lesson from this discussion: The model under consideration here presents a particular example of general relativistic cosmological models wherein there is non-minimal interaction within the dark sector [101,102] -i.e., between the 'cold' dark matter and DE (in our case ). Such cosmological models are of particular interest in the current cosmological studies [103][104][105][106][107][108][109] as it has recently turned out that they are potential candidates for addressing the so-called H 0 tension prevailing within the standard CDM model. Therefore, it is conceivable that the Rastall-CDM model must also be a potential candidate for addressing the H 0 tension.…”

Dynamical dark sectors and neutrino masses and abundances

“…Following our pioneering previous work [55] we shall consider here a time-dependent coupling in nonminimal cosmologies. Given the fact that neutrinos can play a nonstandard role within nonminimal dark energy scenarios [56][57][58][59][60][61][62][63][64][65][66], we extend our previous analyses by inspecting the impact of neutrino properties within interacting cosmologies with a time-dependent coupling. We also generalize the work of Ref.…”

Constraining neutrino mass in dark energy dark matter interaction and comparison with 2018 Planck results

“…Both the model is similar to ours and the data used includes Pantheon data. The result is also closed to the result of [122], the case interacting vacuum scenario (IVS)+ m ν , with m ν < 0.277 eV at 95% CL) and the result of Planck 2018 [185] the case (TT, TE, EE + lowE + lensing) with m ν < 0.241 eV at 95% CL. Using CC data, we find that m ν < 0.199 eV 95%C L (29) which is close to the result of [121], the case IDE+ m ν using (CMB+Pantheon+CC data) with m ν < 0.159 eV at 95 % CL and the result of Planck 2018 [185] the case (TT, lowE + BAO) with m ν < 0.16 eV at 95% CL.…”