Probing kinematics and fate of the Universe with linearly time-varying deceleration parameter

Abstract

The parametrizations $q=q_0+q_{1}z$ and $q=q_0+q_1(1-a/a_0)$ (Chevallier-Polarski-Linder parametrization) of deceleration parameter, which are linear in cosmic redshift $z$ and scale factor $a$, have been frequently utilized in the literature to study kinematics of Universe. In this paper, we follow a strategy that leads to these two well known parametrizations of deceleration parameter as well as an additional new parametrization $q=q_0+q_1(1-t/t_0)$, which is linear in cosmic time $t$. We study the features of this linearly time-varying deceleration parameter in contrast with the other two linear parametrizations. We investigate in detail the kinematics of the Universe by confronting the three models with the latest observational data. We further study the dynamics of the Universe by considering the linearly time-varying deceleration parameter model in comparison with the standard $\Lambda$CDM model. We also discuss future of the Universe in the context of the models under consideration.

15 pages, 3 figures, 9 tables; matches the version published in The European Physical Journal Plus

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• Constraining cosmic deceleration-acceleration transition with type Ia supernova, BAO/CMB and H(z) data
• Constraints on cosmological parameters in power-law cosmology
• Magnetized strange quark model with Big Rip singularity in $f(R,T)$ gravity
• Constraints on a generalized deceleration parameter from cosmic chronometers
• Existence of bulk viscous universe in $f(R,T)$ gravity and confrontation with observational data
• Quantifying the evidence for the current speed-up of the Universe with low and intermediate-redshift data. A more model-independent approach
• Falsifying cosmological models based on a non-linear electrodynamics
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• Anisotropic massive Brans-Dicke gravity extension of the standard $\Lambda$CDM model
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• Interacting Chaplygin gas revisited
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• Probing the matter and dark energy sources in a viable Big Rip model of the Universe