Model Independent Tests of Cosmic Growth vs Expansion

Abstract

We use Gaussian Processes to map the expansion history of the universe in a model independent manner from the Union2.1 supernovae data and then apply these reconstructed results to solve for the growth history. By comparing this to BOSS and WiggleZ large scale structure data we examine whether growth is determined wholly by expansion, with the measured gravitational growth index testing gravity without assuming a model for dark energy. A further model independent analysis looks for redshift dependent deviations of growth from the general relativity solution without assuming the growth index form. Both approaches give results consistent with general relativity.

5 pages, 3 figures; v2 matches PRD version

References in corpus (10)

• The WiggleZ Dark Energy Survey: Joint measurements of the expansion and growth history at z < 1
• The 6dF Galaxy Survey: z \approx 0 measurement of the growth rate and sigma_8
• Reconstruction of dark energy and expansion dynamics using Gaussian processes
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z=0.57 from anisotropic clustering
• Testing cosmological structure formation using redshift-space distortions
• Gaussian Process Cosmography
• Nonparametric Dark Energy Reconstruction from Supernova Data
• Nonparametric Reconstruction of the Dark Energy Equation of State
• Using H(z) data as a probe of the concordance model
• A new perspective on Dark Energy modeling via Genetic Algorithms

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