TY  - JOUR
AU  - Yang, W. Q.
AU  - Mena, O.
AU  - Pan, S.
AU  - Di Valentino, E.
PY  - 2019
DA  - 2019//
TI  - Dark sectors with dynamical coupling
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 083509
EP  - 11pp
VL  - 100
IS  - 8
PB  - Amer Physical Soc
AB  - 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.
SN  - 2470-0010
UR  - https://arxiv.org/abs/1906.11697
UR  - https://doi.org/10.1103/PhysRevD.100.083509
DO  - 10.1103/PhysRevD.100.083509
LA  - English
N1  - WOS:000489039100003
ID  - Yang_etal2019
ER  -