Author:
von Marttens Rodrigo,Barbosa Dinorah,Alcaniz Jailson
Abstract
Abstract
The fact that Einstein's equations connect the space-time geometry to the total matter content of the cosmic substratum, but not to individual contributions of the matter species, can be translated into a degeneracy in the cosmological dark sector. Such degeneracy makes it impossible to distinguish cases where dark energy (DE) interacts with dark matter (DM) from a dynamical non-interacting scenario using observational data based only on time or distance measurements. In this paper, based on the non-adiabatic generalized Chaplygin gas (gCg) model, we derive and study some cosmological consequences of a varying one-parameter dynamical DE parameterization, which does not allow phantom crossing.
We perform a parameter selection using the most recent publicly available data, such as the data from Planck 2018, eBOSS DR16, Pantheon and KiDS-1000. In light of this analysis, we assess how our model responds to the S
8 tension. We find that CMB data impose strong constraints on the model and conclude that the S
8 tension can be alleviated only for values of the model parameters very close to the ΛCDM cosmology.
Subject
Astronomy and Astrophysics
Cited by
3 articles.
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