期刊
PHYSICAL REVIEW D
卷 100, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.083509
关键词
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资金
- National Natural Science Foundation of China [11705079, 11647153]
- MINECO [FPA2017-85985-P, SEV-2014-0398]
- European Union [690575, 674896]
- Mathematical Research Impact-Centric Support Scheme (MATRICS) [MTR/2018/000940]
- Science and Engineering Research Board (SERB), Government of India
- Faculty Research and Professional Development Fund (FRPDF) Scheme of Presidency University, Kolkata, India
- European Research Council [681431]
Coupled dark matter-dark energy scenarios arc modeled via a dimensionless parameter xi, 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 xi 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 xi(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.
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