2019/06/30 by Weiqiang Yang, Olga Mena, Supriya Pan +1 · 1 citation
Engineering · Physics and Astronomy · #Cosmology and Gravitation Theories #Coupling (piping) #Engineering #Galaxies: Formation, Evolution, Phenomena #Mechanical engineering #Physics #Quantum chaos and dynamical systems #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevd.100.083509
published as Phys. Rev. D 100, 083509 (2019) · 11 pages, 4 Tables, 6 captioned figures; version accepted for publication by Physical Review D
arxiv created 2019/09/27 · openalex publication_date 2019/10/07 · arxiv updated 2019/10/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Coupled dark matter--dark energy scenarios are modeled via a dimensionless parameter \ensuremathξ, 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 \ensuremathξ 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 \ensuremathξ(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.