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- Title
Parametrization of the deceleration parameter in a flat FLRW universe: constraints and comparative analysis with the ΛCDM paradigm.
- Authors
Chaudhary, Himanshu; Mumtaz, Saadia; Bouali, Amine; Debnath, Ujjal; Mustafa, G.
- Abstract
The constraint of the deceleration parameter associated with dark energy stands as one of the most captivating subjects in the present cosmological framework. This study centers on the parametric reconstruction of the deceleration parameter in a flat Friedmann–Robertson–Walker (FLRW) Universe that encompasses radiation, dark energy, and pressure-less dark matter. In this context, we thoroughly investigate a highly motivated parametrization of q(z), which offers an evolutionary scenario from deceleration to the acceleration phase of the Universe. The crucial task of estimating the parametrization of the Hubble parameter is accomplished through its incorporation into the Friedmann equation. The free parameters are subsequently constrained utilizing a comprehensive set of observational data, including H(z), type Ia supernovae (SNIa), Baryon Acoustic Oscillation (BAO), Gamma Ray Burst (GRB), and Quasar (Q) measurements. Implementing the Markov Chain Monte Carlo (MCMC) technique and the H(z) + BAO + SNIa + GRB + Q dataset, we derive the best-fit values for the model parameters. Consequently, we provide a graphical analysis of the cosmographic parameters such as deceleration, jerk, and snap parameters by applying these optimized model parameter values. Finally, we compare our results with those of the standard Λ CDM paradigm to evaluate the viability of our proposed models.
- Subjects
DARK energy; GAMMA ray bursts; ACCELERATION (Mechanics); MARKOV chain Monte Carlo; TYPE I supernovae; FRIEDMANN equations
- Publication
General Relativity & Gravitation, 2023, Vol 55, Issue 11, p1
- ISSN
0001-7701
- Publication type
Article
- DOI
10.1007/s10714-023-03181-w