Determination of the kinematic parameters from SNe Ia and cosmic chronometers

• Published in: The European physical journal. C, Particles and fields Vol. 82; no. 5; pp. 1 - 14
• Main Authors: Benndorf, D., Jesus, J. F., Pereira, S. H.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2022; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Astronomical models; Astronomy; Astrophysics and Cosmology; Chronometers; Deceleration; Dynamic models; Elementary Particles; Hadrons; Heavy Ions; Hubble constant; Kinematics; Measurement Science and Instrumentation; Measuring instruments; Nuclear Energy; Nuclear Physics; Parameterization; Parameters; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Red shift; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-022-10378-x

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 ± 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.