Determination of the kinematic parameters from SNe Ia and cosmic chronometers

Abstract

In this work, by assuming a spatially flat Universe, we have tested 8 kinematic parametrization models with H(z) data from Cosmic Chronometers and SNe Ia from Pantheon compilation. Our aim is obtain the current values for the Hubble constant (H), deceleration parameter (q), jerk (j) and snap (s) parameters independently from a dynamical model. By using a Bayesian model comparison, three models are favoured: a model with the deceleration parameter (q) linearly dependent on the redshift, q linearly dependent on the scale factor and a model with a constant jerk. The model with constant jerk is slightly favoured by this analysis, furnishing H0=68.8-3.6+3.7 km/s/Mpc, q= - 0.58 ± 0.13 , j0=1.15-0.53+0.56 and s0=-0.25-0.30+0.40. The other models are compatible with the constant jerk model, except for the snap parameter, where we have found s0=4.0-3.0+3.4 for the model with q linearly dependent on the scale factor.