Analytic study of the effect of dark energy-dark matter interaction on the growth of structures

Large-scale structure has been shown as a promising cosmic probe for distinguishing and constraining dark energy models. Using the growth index parametrization, we obtain an analytic formula for the growth rate of structures in a coupled dark energy model in which the exchange of energy-momentum is...

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Veröffentlicht in:	arXiv.org 2016-10
Hauptverfasser:	Marcondes, Rafael J F, Landim, Ricardo C G, Costa, André A, Wang, Bin, Abdalla, Elcio
Format:	Artikel
Sprache:	eng
Schlagworte:	Continuity equation Dark energy Dark matter Equations of state Flux density Large scale structure of the universe Parameterization Physics - Cosmology and Nongalactic Astrophysics Physics - General Relativity and Quantum Cosmology Variation Velocity distribution
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creator	Marcondes, Rafael J F Landim, Ricardo C G Costa, André A Wang, Bin Abdalla, Elcio
description	Large-scale structure has been shown as a promising cosmic probe for distinguishing and constraining dark energy models. Using the growth index parametrization, we obtain an analytic formula for the growth rate of structures in a coupled dark energy model in which the exchange of energy-momentum is proportional to the dark energy density. We find that the evolution of $f \sigma_8$ can be determined analytically once we know the coupling, the dark energy equation of state, the present value of the dark energy density parameter and the current mean amplitude of dark matter fluctuations. After correcting the growth function for the correspondence with the velocity field through the continuity equation in the interacting model, we use our analytic result to compare the model's predictions with large-scale structure observations.
doi_str_mv	10.48550/arxiv.1605.05264
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subjects	Continuity equation Dark energy Dark matter Equations of state Flux density Large scale structure of the universe Parameterization Physics - Cosmology and Nongalactic Astrophysics Physics - General Relativity and Quantum Cosmology Variation Velocity distribution
title	Analytic study of the effect of dark energy-dark matter interaction on the growth of structures
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