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      Measurements of H0 and reconstruction of the dark energy properties from a model-independent joint analysis

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          Abstract

          Gaussian processes (GP) provide an elegant and model-independent method for extracting cosmological information from the observational data. In this work, we employ GP to perform a joint analysis by using the geometrical cosmological probes such as Supernova Type Ia (SN), Cosmic chronometers (CC), Baryon Acoustic Oscillations (BAO), and the H0LiCOW lenses sample to constrain the Hubble constant H0

          , and reconstruct some properties of dark energy (DE), viz., the equation of state parameter w, the sound speed of DE perturbations c2s
          , and the ratio of DE density evolution X=ρde/ρde,0
          . From the joint analysis SN+CC+BAO+H0LiCOW, we find that H0
          is constrained at 1.1% precision with H0=73.78±0.84 km s1Mpc1
          , which is in agreement with SH0ES and H0LiCOW estimates, but in 6.2σ
          tension with the current CMB measurements of H0
          . With regard to the DE parameters, we find c2s<0
          at 2σ
          at high z, and the possibility of X to become negative for z>1.5
          . We compare our results with the ones obtained in the literature, and discuss the consequences of our main results on the DE theoretical framework.

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          Most cited references78

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          Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant

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            Measurements of Ω and Λ from 42 High‐Redshift Supernovae

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              The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample

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                Author and article information

                Journal
                The European Physical Journal C
                Eur. Phys. J. C
                Springer Science and Business Media LLC
                1434-6044
                1434-6052
                February 2021
                February 05 2021
                February 2021
                : 81
                : 2
                Article
                10.1140/epjc/s10052-021-08925-z
                283c2ad9-30a5-4aae-beec-5a2cacb684d8
                © 2021

                https://creativecommons.org/licenses/by/4.0

                https://creativecommons.org/licenses/by/4.0

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