Using our newest VLT-KMOS HII galaxies and other cosmic tracers to tes the Lambda cold dark matter tension

We place novel constraints on the cosmokinetic parameters by using a joint analysis of the newest Very Large Telescope (VLT)-K-band Multi Object Spectrograph (KMOS) HII galaxies (HIIG) with the Type Ia Supernovae (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 Lambda cold dark matter (Lambda CDM). In the case of SNIa, we find that the extracted values of the cosmokinetic parameters are in agreement with the predictions of Lambda CDM model. Combining SNIa with high-redshift tracers of the Hubble relation, namely HIIG data, we obtain consistent results with those based on Lambda CDM 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 Lambda CDM model.

Automated summary

By jointly analyzing the VLT-KMOS HII galaxies with SNIa data, novel constraints on cosmokinetic parameters were placed to reconstruct the Hubble diagram to higher redshifts. The results show that while the parameters derived from SNIa data align with the predictions of Lambda CDM model, significant deviations in the evolution of cosmokinetic parameters are observed when combining with HIIG data.