Bulk viscous fluid in extended symmetric teleparallel gravity

Koussour, M.; Shekh, S. H.; Беннаи, М.; Ouali, Taoufik

doi:10.1016/j.cjph.2022.11.013

Cited by 8 publications

(7 citation statements)

References 49 publications

(42 reference statements)

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“…Rani et al [77] used state-finder analysis to investigate the power law cosmology. Recently, Koussour and Bennai [78] employed the power law to investigate cosmic acceleration in an anisotropic Universe in f (Q) gravity.…”

Section: A Cosmological Model Withmentioning

confidence: 99%

“…One must relax the assumption of FLRW geometry from the very start and investigate the transition from an anisotropic and inhomogeneous state to the observed level of homogeneity and isotropy. A number of recent articles in several modified gravity theories can be cited [55][56][57][58][59][60] for a diverse field of investigation in the background of anisotropic Bianchi type Universe models. In the present discussion we consider a special type of Bianchi Universe, the locally rotationally symmetric (LRS) Bianchi type-I model to denote the anisotropic state of the Universe, given by the metric in the Cartesian coordinates…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic Universe in $f(Q,T)$ gravity, a novel study

Loo¹,

Koussour²,

De³

2023

Preprint

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f (Q, T) theory of gravity is very recently proposed to incorporate within the action Lagrangian, the trace T of the energy-momentum tensor along with the non-metricity scalar Q. The cosmological application of this theory in a spatially flat isotropic and homogeneous Universe is well-studied. However, our Universe is not isotropic since the Planck era and therefore to study a complete evolution of the Universe we must investigate the f (Q, T) theory in a model with a small anisotropy. This motivated us to presume a locally rotationally symmetric (LRS) Bianchi-I spacetime and derive the motion equations. We analyse the model candidate f (Q, T) = αQ n+1 + βT, and to constrain the parameter n, we employ the statistical Markov chain Monte Carlo (MCMC) method with the Bayesian approach using two independent observational datasets, namely, the Hubble datasets, and Type Ia supernovae (SNe Ia) datasets.

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Section: A Cosmological Model Withmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropic Universe in $f(Q,T)$ gravity, a novel study

Loo¹,

Koussour²,

De³

2023

Preprint

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“…This implies that while 𝜎 𝜃 is constant, the Hubble expansion of the Universe can attain isotropic. [49][50][51][52][53][54][55] This condition leads to A(t) = B(t) 𝛾 , where 𝛾 ≠ 1 is an arbitrary constant. When 𝛾 = 1, the model becomes isotropic.…”

Section: The F (Q T) = Q + Bt Modelmentioning

confidence: 99%

“…This implies that while

\frac{\sigma }{\theta }

is constant, the Hubble expansion of the Universe can attain isotropic. [ 49–55 ] This condition leads to

A(t) =B(t) ^{\gamma }

, where

\gamma \ne 1

is an arbitrary constant. When

\gamma =1

, the model becomes isotropic.…”

Section: Field Equations Of Lrs Bianchi‐i Cosmology In Ffalse(qtfalse...mentioning

confidence: 99%

Observational Constraints on Hybrid Scale Factor in f(Q,T)$f(Q,T)$ Gravity with Anisotropic Space‐Time

2023

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In this paper, we present an accelerating cosmological model by constraining the free parameters using the cosmological datasets in an extended symmetric teleparallel gravity for the flat and anisotropic space-time. We employ a time variable deceleration parameter that behaves early deceleration and late time acceleration in the form of hybrid scale factor (HSF). We obtain the present values of deceleration parameter and analyse the late time behavior of the Universe based on the best-fit values of free parameters. We derive the dynamical parameters of the model and obtain the equation of state parameter at present in the quintessence region; however at late time it approaches to ΛCDM. The energy conditions are also analysed to validate the modified gravity and we find that strong energy condition is violating. We establish the importance of hybrid scale factor in the late time cosmic phenomena issue.

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“…Further research reveals that various forms of DE exist, such as quintessence, phantom, tachyon, dilation, and interacting dark energy models such as holographic and agegraphic models [8][9][10][11][12][13]. Further, the cosmic viscosity is effective in playing the function of DE candidate, forcing the cosmos to accelerate [14,15]. According to Wilkinson Microwave Anisotropy Probe (WMAP) observations, DE accounts for 68.3% of all energy in the cosmos, dark matter accounts for 26.8%, and baryonic matter accounts for the remaining 4.9% [16].…”

Section: Introductionmentioning

confidence: 99%

A model-independent method with phantom divide line crossing in Weyl-type f(Q,T) gravity

Koussour

2023

Chinese Journal of Physics

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Bulk viscous fluid in extended symmetric teleparallel gravity

Cited by 8 publications

References 49 publications

Anisotropic Universe in $f(Q,T)$ gravity, a novel study

Anisotropic Universe in $f(Q,T)$ gravity, a novel study

Observational Constraints on Hybrid Scale Factor in f(Q,T)$f(Q,T)$ Gravity with Anisotropic Space‐Time

A model-independent method with phantom divide line crossing in Weyl-type f(Q,T) gravity

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