Reconstructing a non-linear interaction in the dark sector with cosmological observations

Abstract

In this work we model two non-linear directly interacting scenarios in dark sector of the universe with the dimensionless parameter $\alpha$ and $\beta$, which dominate the energy exchange between dark energy and dark matter. The central goal of this investigation is to research the interacting model and discuss the cosmological implications based on the current observational datasets. The class of the interaction is generally characterized by a coupling function $Q\propto H(z){\rho }_x$, $x$ denotes the energy density of dark matter or dark energy. The constrained results we obtained indicate that the direct interaction in cosmic dark sector is favored by various observational data and the key effects on CMB power spectrum and linear matter power spectrum appear compared to $\Lambda$CDM standard paradigm. Finally, we discuss in depth the effect of different neutrino mass hierarchy on matter power spectrum and the variation of the ratio of CMB temperature power spectrum $C_{\ell }^{TT}$ and matter power spectrum $P(k)$ when the $\Delta N_{eff}=N-3.046$ from 0.5 to 2, respectively.

14 pages,12 figures, 4 tables,Accepted for publication by Physics of the Dark Universe

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• On the dynamics of a dark sector coupling
• Dark Matter Halos in Interacting Dark Energy Models: Formation History, Density Profile, Spin and Shape
• IWDM: The fate of an interacting non-cold dark matter $-$ vacuum scenario
• Gravitational wave signatures from dark sector interactions
• Redshift drift effect through the observation of HI 21cm signal with SKA
• Vainshtein screening in Horndeski theories nonminimally and kinetically coupled to ordinary matter