Constraints on the Parameterized Deceleration Parameter in FRW Universe

Abstract

Confirmation of accelerated expansion of the universe probed the concept of dark energy theory, and since then, numerous models have been introduced to explain its origin and nature. The present work is based on reconstructing dark energy by parametrization of the deceleration parameter in the FRW universe filled with radiation, dark matter and dark energy. We have chosen some well-motivated parametrized models 1-3 in an attempt to investigate the energy density in terms of deceleration parameters by estimating the cosmological parameters with the help of different observational datasets. Also, we have introduced a new model 4 for the parametrization of the deceleration parameter. Then we analyzed the cosmography parameters using the best-fit values of the parameters. Using the information criteria, we have examined the viability of the models.

The Simplest Parametrization of the Equation of State Parameter in the Scalar Field Universe

“…Furthermore, we note that the authors of Refs. [95,96] use similar data sets for constraining the observational parameters of the Universe. In Bouali et al [96], the present acceleration of the Universe is described by taking into consideration the parameterized deceleration parameter q(z).…”

Constraints on the parameterized deceleration parameter in FRW universe

“…In the study of the generalized holographic dark energy model, some well-known parametrization type models have been considered [22,23]. Till now, some authors have assumed some possible forms of parametrization of deceleration parameter [24][25][26][27][28][29][30][31][32][33][34][35]. The main advantage behind introducing a parameterization of the deceleration parameter is to provide a framework that is independent of specific gravitational theories.…”

Observational Constraining Study of New Deceleration Parameters in FRW Universe

“…[19,20] A large body of literature is available on the possible parametrization of DP. [21][22][23][24][25][26][27][28][29][30] Consequently, the results may be independent of any particular gravitational theory which is one of the prominent advantages of parameterizing the DP. An analogous parameterized DP has also been introduced for the well-established models in place of parameterized DE equation of state.…”