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

Understand

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.