Effects of dark sectors' mutual interaction on the growth of structures

Abstract

We present a general formalism to study the growth of dark matter perturbations when dark energy perturbations and interactions between dark sectors are present. We show that dynamical stability of the growth of structure depends on the type of coupling between dark sectors. By taking the appropriate coupling to ensure the stable growth of structure, we observe that the effect of the dark sectors' interaction overwhelms that of dark energy perturbation on the growth function of dark matter perturbation. Due to the influence of the interaction, the growth index can differ from the value without interaction by an amount within the observational sensibility, which provides a possibility to disclose the interaction between dark sectors through future observations on the growth of large structure.

15 pages, 4 figures, revised version, to appear in JCAP

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• Unified dark energy thermodynamics: varying w and the -1-crossing
• Cosmological Evolution of Quintessence and Phantom with a New Type of Interaction in Dark Sector
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• Covariantizing the interaction between dark energy and dark matter
• Chameleon dark energy models with characteristic signatures
• Interacting entropy-corrected agegraphic-tachyon dark energy
• Interacting Cosmological Fluids and the Coincidence Problem
• Revisiting the Cosmological Constraints on the Interacting Dark Energy Models
• Impacts of gravitational-wave standard siren observations from Einstein Telescope and Cosmic Explorer on weighing neutrinos in interacting dark energy models
• Probing the sign-changeable interaction between dark energy and dark matter with current observations
• Dark Matter Halos in Interacting Dark Energy Models: Formation History, Density Profile, Spin and Shape
• One Thousand and One Clusters: Measuring the Bulk Flow with the Planck ESZ and X-Ray Selected Galaxy Cluster Catalogs
• Constraints on the dark matter and dark energy interactions from weak lensing bispectrum tomography
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• An analytical method to simulate the HI 21-cm visibility signal for intensity mapping experiments
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• Coupled Dark Energy field variation
• Dispersion in the growth of matter perturbations
• Density pertubation of unparticle dark matter in the flat Universe