CM4 - Tensions on LCDM cosmological model and model-independent constraints |
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Shafieloo, Arman |
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Falsifying ΛCDM: Model-independent tests of the concordance model with eBOSS DR14Q and Pantheon |
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Abstract |
Invited talk for the parallel session CM4: "Tensions on LCDM cosmological model and model-independent constraints" (co-chaired by Joan Solà and Luca Amendola) We combine model-independent reconstructions of the expansion history from the latest supernovae distance modulus compilation and measurements from baryon acoustic oscillation to test some important aspects of the concordance model of cosmology namely the FLRW metric and flatness of spatial curvature. We then use the reconstructed expansion histories to fit growth measurement from redshift-space distortion and obtain strong constraints on (Ωm,γ,σ8) in a model independent manner. Our results show consistency with a spatially flat FLRW Universe with general relativity to govern the perturbation in the structure formation and the cosmological constant as dark energy. However, we can also see some hints of tension among different observations within the context of the concordance model related to high redshift observations of the expansion history. This supports earlier findings of Sahni et al. (2014) & Zhao et al. (2017) and highlights the importance of precise measurement of expansion history and growth of structure at high redshifts. |
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