Unphysical properties in a class of interacting dark energy models

Article Article scientifique Article Unphysical properties in a class of interacting dark energy models eng 2020-12-03 2020-12-03 author Marttens Rodrigo 0000-0003-3954-5756 908611 author Borges H. A. author Carneiro S. 0000-0001-7098-383X author Alcaniz J. S. 0000-0003-2441-1413 author Zimdahl W. 0000-0001-8138-2319 110 10.1140/epjc/s10052-020-08682-5 1434-6044 http://link.springer.com/10.1140/epjc/s10052-020-08682-5 <p>Models with non-gravitational interactions between the dark matter and dark energy components are an alternative to the standard cosmological scenario. These models are characterized by an interaction term, and a frequently used parameterization is $$Q = 3\xi H \rho _{x}$$ Q = 3 ξ H ρ x , where H is the Hubble parameter and $$\rho _{x}$$ ρ x is the dark energy density. Although recent analyses have reported that this particular scenario provides a potential solution to the $$H_{0}$$ H 0 and $$\sigma _{8}$$ σ 8 tensions for negative values of the interaction parameter $$\xi $$ ξ , we show here that such an interval of values of $$\xi $$ ξ leads to a violation of the Weak Energy Condition for the dark matter density, which is accompanied by unphysical instabilities of matter perturbations. Using current observational data we also show that the inclusion of the physical prior $$\xi \ge 0$$ ξ ≥ 0 in the statistical analysis alters the parameter selection for this model and discards it as a solution for the $$H_{0}$$ H 0 -tension problem.</p> Dewey 500.2 37 Département de physique théorique 133 false European physical journal. C, Particles and fields 80 12 41725282-dffb-4492-bd3c-7e07e22edd2d Article (Published version) Public Article-scientifique-from-unpaywall.pdf 1080555 application/pdf CC BY-4.0 4e9fbb9d099e8a020cb6cfb321aa3d7ce2cb19aa0ede6825ce929bf2f26ec022 openAccess Faculté des sciences / Section de physique / Département de physique théorique

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Unphysical properties in a class of interacting dark energy models	European physical journal. C, Particles and fields			2020	74	81

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Marttens, Rodrigo