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Dark sectors with dynamical coupling

AuthorsYang, W.; Mena, Olga.; Pan, S.; Di Valentino, E.
Issue DateOct-2019
CitationPhysical Review D 100 8: 083509 (2019)
AbstractCoupled dark matter-dark energy scenarios are modeled via a dimensionless parameter ζ, which controls the strength of their interaction. While this coupling is commonly assumed to be constant, there is no underlying physical law or symmetry that forbids a time-dependent ζ parameter. The most general and complete interacting scenarios between the two dark sectors should therefore allow for such a possibility, and it is the main purpose of this study to constrain two possible and well-motivated coupled cosmologies by means of the most recent and accurate early- and late-time universe observations. We find that CMB data alone prefer ζ(z)>0 and therefore a smaller amount of dark matter, alleviating some crucial and well-known cosmological data tensions. An objective assessment of the Bayesian evidence for the coupled models explored here shows no particular preference for the presence of a dynamical dark sector coupling.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.100.083509
Identifiersdoi: 10.1103/PhysRevD.100.083509
issn: 2470-0029
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