Using our newest VLT-KMOS HII Galaxies and other cosmic tracers to test the ΛCDM tension

Monthly Notices of the Royal Astronomical Society(2021)

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摘要
We place novel constraints on the cosmokinetic parameters by using a joint analysis of the newest VLT-KMOS HII galaxies (HIIG) with the Supernovae Type Ia (SNIa) Pantheon sample. We combine the latter data sets in order to reconstruct, in a model independent way, the Hubble diagram to as high redshifts as possible. Using a Gaussian process we derive the basic cosmokinetic parameters and compare them with those of ΛCDM. In the case of SNIa we find that the extracted values of the cosmokinetic parameters are in agreement with the predictions of ΛCDM model. Combining SNIa with high redshift tracers of the Hubble relation, namely HIIG data we obtain consistent results with those based on ΛCDM as far as the present values of the cosmokinetic parameters are concerned, but find significant deviations in the evolution of the cosmokinetic parameters with respect to the expectations of the concordance ΛCDM model.
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