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arXiv · 1907.07540

Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the $H_0$ tension

Supriya Pan·Weiqiang Yang·Eleonora Di Valentino·Emmanuel N. Saridakis·Subenoy Chakraborty
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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 $H_0$. In all examined scenarios we find a non-zero interaction, nevertheless the non-interacting case is allowed within 2$\sigma$. 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 $H_0$ are greater compared to the $\Lambda$CDM-based Planck's estimation and close to the local measurements, thus alleviating the $H_0$ tension.

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Supriya Pan, Weiqiang Yang, Eleonora Di Valentino, Emmanuel N. Saridakis, Subenoy Chakraborty. 2019-07-17. Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the $H_0$ tension. https://doi.org/10.1103/physrevd.100.103520

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