Unified dark fluid and cosmic transit models in Brans–Dicke theory

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.

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“…[ 13,14 ] Some useful applications of dark components in anisotropic space time are given in Refs. [15–25].…”

Section: Introductionmentioning

confidence: 99%

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

Goswami

Yadav²,

Mishra

et al. 2021

Fortschritte der Physik

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“…This assumption provides q −1 + 1 β at t → 0 and q −1 at t → ∞. The cosmological aspect of the HSF has already been investigated in some earlier works [24][25][26][27][28][29][30][31][32]. It is worth to mention here that, the HSF provides us a deceleration parameter which assumes early positive values and late epoch negative values.…”

Section: Cosmological Modelsmentioning

confidence: 83%

“…[33]. Recently, Tripathy et al [30,31] have constructed four HSF models basing upon the H(z) data. These models are termed as HSF11, HSF21, HSF12 and HSF22 respectively.…”

Section: Cosmological Modelsmentioning

confidence: 99%

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Model parameters in the context of late time cosmic acceleration in $f(Q,T)$ gravity

Pati,

Mishra,

Tripathy

2021

Preprint

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The dynamical aspects of some accelerating models are investigated in the framework of an extension of symmetric teleparllel gravity dubbed as f (Q, T ) gravity. In this gravity theory, the usual Ricci tensor in the geometrical action is replaced by a functional f (Q, T ) where Q is the non-metricity and T is the trace of the energy-momentum tensor. Two different functional forms are considered in the present work. In order to model the Universe, we have considered a signature flipping deceleration parameter simulated by a hybrid scale factor (HSF). The dynamical parameters of the model are derived and analysed. We discuss the role of the parameter space in getting viable cosmological models. It is found that, the models may be useful as suitable geometrical alternatives to the usual dark energy approach.

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“…usually considered to be proportional to the scalar expansion θ(= 3H) [11][12][13][14][15]. This leads to an anisotropy relation between the metric potentials b and c in the form b = c m .…”

Section: Mathematical Set Up With Physical Parametersmentioning

confidence: 99%

Stability analysis of two-fluid dark energy models

Mishra,

Esmaeili,

Ray

et al. 2021

Preprint

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In this paper, we have studied the stability of the cosmological models with dark energy and combination of matter fields and dark energy in an anisotropic space time. The pressure anisotropy along the spatial directions are derived and its stability in each direction has been examined. The four models presented here, show its stability on certain spatial direction. The role of matter field on the stability analysis has been obtained. The positive and negative value of cosmic string completely changed the stability behaviour of the model. The presence of a magnetic field disturbs the stability aspects of the models at least in an early epoch.

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Unified dark fluid and cosmic transit models in Brans–Dicke theory

Cited by 28 publications

References 81 publications

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

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

Model parameters in the context of late time cosmic acceleration in $f(Q,T)$ gravity

Stability analysis of two-fluid dark energy models

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