Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the tension
arXiv:1907.07540 · doi:10.1103/PhysRevD.100.103520
Abstract
We investigate interacting scenarios which 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 Cosmic Microwave Background (CMB), Joint light-curve (JLA) sample from Supernovae Type Ia, Baryon Acoustic Oscillations (BAO), Hubble parameter measurements from Cosmic Chronometers (CC) and a gaussian prior on the Hubble parameter . In all examined scenarios we find a non-zero interaction, nevertheless the non-interacting case is allowed within 2. Concerning the current value of the dark energy equation of state for all combination of datasets it always lies in the phantom regime at more than two/three standard deviations. Finally, for all interacting models, independently of the combination of datasets considered, the estimated values of the present Hubble parameter are greater compared to the CDM-based Planck's estimation and close to the local measurements, thus alleviating the tension.
arXiv comment18 pages, 7 tables, 9 figures, to appear in Physical Review D
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