6533b853fe1ef96bd12accc6

RESEARCH PRODUCT

Dark sectors with dynamical coupling

Eleonora Di ValentinoOlga MenaSupriya PanWeiqiang Yang

subject

PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsmedia_common.quotation_subjectDark matterCosmic microwave backgroundFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsCoupling (probability)01 natural sciencesSymmetry (physics)UniverseGeneral Relativity and Quantum CosmologyTheoretical physics0103 physical sciences010306 general physicsConstant (mathematics)Energy (signal processing)media_commonDimensionless quantityAstrophysics - Cosmology and Nongalactic Astrophysics

description

Coupled dark matter-dark energy scenarios are modeled via a dimensionless parameter $��$, 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 $��$ 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 prefers $��(z) >0$ 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.

10.1103/physrevd.100.083509http://arxiv.org/abs/1906.11697