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Defying the laws of Gravity I: Model-independent reconstruction of the Universe expansion from growth data

, , , and . (2019)cite arxiv:1906.05991Comment: 7 pages, 7 figures.

Abstract

Using redshift space distortion data, we perform model-independent reconstructions of the growth history of matter inhomogeneity in the expanding Universe using two methods: crossing statistics and Gaussian processes. We then reconstruct the corresponding history of the Universe background expansion and fit it to type Ia supernovae data, putting constraints on $(Ømega_m,0,\sigma_8,0)$. The results obtained are consistent with the concordance flat-$Łambda$CDM model and General Relativity as the gravity theory given the current quality of the inhomogeneity growth data.

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Defying the laws of Gravity I: Model-independent reconstruction of the Universe expansion from growth data

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lhuillier2019defying
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