The growth index of matter perturbations using the clustering of dark energy

Abstract

We have put forward a new unified framework which provides a consistent and rather complete account of the growth index of matter perturbations in the regime where the dark energy is allowed to have clustering. In particular, we find that the growth index is not only affected by the cosmological parameters but rather it depends on the choice of the considered dark energy (homogeneous or clustered). Using the {\em Planck} priors and performing a standard ${\chi }^2$-minimization between theoretical expectations and growth data, we statistically quantify the ability of the growth index to represent the observations. Finally, based on the growth index analysis we find that the growth data favour the clustered dark energy scenario.

6 pages, 2 figures Accepted for publication in MNRAS (minor corrections: a new title, some new references and the Planck2015 priors are included)

References in corpus (12)

• Testing LCDM with the Growth Function δ(a): Current Constraints
• On the growth of linear perturbations
• Structure formation in the presence of dark energy perturbations
• The dispersion of growth of matter perturbations in f(R) gravity
• Fingerprinting dark energy
• Growth Index of DGP Model and Current Growth Rate Data
• Effects of shear and rotation on the spherical collapse model for clustering dark energy
• Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures
• The spherical collapse model and cluster formation beyond the $\Lambda$ cosmology: Indications for a clustered dark energy?
• Growth factor parametrization in curved space
• Fingerprinting Dark Energy II: weak lensing and galaxy clustering tests
• Probing non-standard gravity with the growth index: a background independent analysis

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• Scalar field descriptions of two dark energy models