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 ($H_0$), deceleration parameter ($q_0$), jerk ($j_0$) and snap ($s_0$) 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 $H_0=68.8_{-3.6}^{+3.7}$ km/s/Mpc, $q_0=-0.58\pm 0.13$, $j_0=1.15_{-0.53}^{+0.56}$ and $s_0=-0.25_{-0.30}^{+0.40}$. The other models are compatible with the constant jerk model, except for the snap parameter, where we have found $s_0=4.0_{-3.0}^{+3.4}$ for the model with $q$ linearly dependent on the scale factor. (All uncertainties in the Abstract correspond to 95\% c.l.).

23 pages, 7 figures

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