http://arxiv.org/abs/2002.12063
The present work is based on the reconstruction of late-time cosmological dynamics using purely kinematical models. The models are constructed from different parameterizations of the deceleration parameter. The models are confronted with cosmological observations which are completely independent of any fiducial assumption about the background cosmological model. Different kinematical parameters, namely the present Hubble parameter, present value of the deceleration parameter and the redshift of transition from decelerated to accelerated phase of expansion are constrained by Markov Chanin Monte Charlo (MCMC) analysis using the observation data sets. The evolution of different cosmological quantities are studied for the present models. The evolution of linear matter density contrast has been studied for the present kinematical models and the result is compared with the standard cosmological constant dark energy scenario. The thermodynamic nature of the universe has also been emphasized in the present context.
A. Mukherjee
Fri, 28 Feb 20
32/49
Comments: 12 pages, 9 figures
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