Modeling of Accelerating Universe with Bulk Viscous Fluid in Bianchi V Space‐Time

Abstract

In this paper, we have investigated a bulk viscous anisotropic Universe and constrained its model parameters with recent H(z) and Pantheon compilation data. Using cosmic chronometric technique, we estimate the present value of Hubble's constant as H0=69.39±1.54kms−1Mpc−1, 70.016±1.65kms−1Mpc−1 and 69.36±1.42kms−1Mpc−1 by bounding our derived model with recent H(z) data, Pantheon and joint H(z) and Pantheon data respectively. The present age of the Universe is specified as t0=0.9796H0−1∼13.79 Gyrs. The model favours a transitioning Universe with the transition red‐shift as zt=0.73. We have reconstructed the jerk parameter using the observational data sets. From the analysis of the jerk parameter, it is observed that, our derived model shows a marginal departure from the concordance ΛCDM model.

Dynamics of quasi de Sitter and linear combination of exponential models in extended gravity

“…At the present epoch (z = 0), the QDS model within the chosen parameter space, predicts j 0 = 0.4 and shows a possible departure from the concordance ΛCDM value j 0 = 1. The present result is quite consistent with the results obtained in a recent analysis [62]. In FIG.…”

“…It is worth to mention here that a recent analysis constrained the deceleration parameter at the present epoch as q 0 = −1.08 ± 0.29 [61]. In another work, Goswami et al have obtained a constraint as q 0 = −0.59 [62]. In this sense, the QDS model is consistent with the present cosmic scenario.…”

An Axially Symmetric Transitioning models with Observational Constraints

“…All of the above findings were discovered by a simple analysis of "55 supernova data points". 46 Hubble parameters H(z) data set in the redshifts range 0 ≤ z ≤ 2.36 were used to estimate present value of Hubble constant along with baryon and dark energy parameters [33,34,35,36]. The authors of these references have also analyzed the cumulative effect of H(z) data, SN Ia pantheon compilation data, and BAO data in the estimation of model parameters.…”

Bulk Viscous Bianchi Type-V Cosmological Model in f(R, T) Theory of Gravity

“…The bulk viscosity cosmological models have been discussed, and the model's nature has been discussed by Fabris (Fabris et al, 2006), Singh (Singh and Baghel, 2009), Yadav (Yadav and Yadav, 2011), Singh (Bali et al, 2012), Kiran (Kiran and Reddy, 2013), Mahanta (Mahanta, 2014), Rao (Bhaskara Rao et al, 2015), Tiwari (Tiwari and Tiwari, 2017), and Sahoo (Sahoo and Reddy, 2018). Very recently Goswami (Goswami et al, 2021) and Kotambkar (Kotambkar et al, 2021) have investigated the modeling of accelerating and the dynamical behaviours of Chaplygin gas, cosmological and gravitational "constants" with cosmic viscous fluid in different contexts.…”