Interacting scenarios with dynamical dark energy: Observational constraints and alleviation of the H0 tension
We investigate interacting scenarios that belong to a wider class, since they include a dynamical dark energy component whose equation of state follows various one-parameter parametrizations. We confront them with the latest observational data from the cosmic microwave background, the joint light-curve sample from type Ia supernovae, baryon acoustic oscillations, Hubble parameter measurements from cosmic chronometers (CC), and a Gaussian prior on the Hubble parameter H0. In all examined scenarios we find a nonzero interaction; nevertheless, the noninteracting case is allowed within 2 σ . Concerning the current value of the dark energy equation of state for all combinations of data sets, it always lies in the phantom regime at more than 2-3 standard deviations. Finally, for all interacting models, independently of the combination of data sets considered, the estimated values of the present Hubble parameter H0 are greater compared to the Λ CDM -based Planck estimate and close to the local measurements, thus alleviating the H0 tension.
Physical Review D
- Pub Date:
- November 2019
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- General Relativity and Quantum Cosmology
- 18 pages, 7 tables, 9 figures, to appear in Physical Review D