Interacting dark energy with time varying equation of state and the H0 tension

By Weiqiang Yang, A. Mukherjee, E. di Valentino, Supriya Pan. Physical Review D, 2018

135 citations recorded by the source corpus.

Almost in all coupled dark energy models present in the literature, the stability of the model becomes potentially sensitive to the dark energy equation of state parameter $w_x$, and a singularity arises at `$w_x = -1$'. Thus, it becomes mandatory to test the stability of the model into two separate regions, namely, the quintessence and phantom and certainly, a discontinuity appears into the parameters space of the dark energy state parameter. Such discontinuity can be removed with some choices of the coupling function. In the present work we choose one particular coupling between dark matter and dark energy which can successfully remove such instability and we allow a dynamical dark energy equation of state parameter instead of the constant one. We have considered one parameter dynamical dark energy equation of state, and the interacting scenario have been confronted with several observational data with latest origin. The results show that the present cosmological data allow an interaction in the dark sector, in agreement with some latest claims by several authors, and additionally, a phantom behaviour in the dark energy equation of state is suggested at present. Moreover, for this case the tension on $H_0$ is clearly released. As a final remark, we should mention that according to the Bayesian analysis, $\Lambda$CDM is always favored over this interacting dark energy model.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/dd0fdbaf439ce2007236c2bcad959c91d084d928

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Citations in the corpus

Cosmology Intertwined II: The Hubble Constant Tension (2020, unknown): “[59] W.”
Interacting scenarios with dynamical dark energy: Observational constraints and alleviation of the H0 tension (2019, background): “This motivates us to consider a wider picture in which the interaction should be allowed too, and to check whether the H0 tension is still released, since it has been argued that an allowance of a non-gravitational interaction between dark matter and dark energy naturally increases the error bars on”
Nonminimal dark sector physics and cosmological tensions (2019, background): “4 These models may also be an interesting key towards solving some existing cosmological tensions [188, 210–224].”
New physics in light of the H0 tension: An alternative view (2019, background): “[60–209] for what is inevitably an incomplete list of works examining these possibilities.”