Bulk viscous fluid in extended symmetric teleparallel gravity

Abstract

In this paper, we investigate the existence of bulk viscous FLRW cosmological models in a recently proposed extended symmetric teleparallel gravity or $f\left(Q,T\right)$ gravity in which $Q$ is the non-metricity and $T$ is the trace of the energy-momentum tensor. We consider a simple coupling between matter and non-metricity, specifically, $f\left(Q,T\right)=\alpha Q^{m+1}+\lambda T$ and $f\left(Q,T\right)=\alpha Q+\lambda T$ where $\alpha$, $\lambda$ and $m$ are free model parameters. The exact cosmological solutions are found by assuming the scale factor in the form of the hybrid expansion law. This type of relation generates a time-varying deceleration parameter with the transition of the Universe from the early decelerating phase to the present accelerating phase. In the presence of viscous fluid, we analyze some cosmological parameters of our cosmological model such as the energy density, bulk viscous pressure, bulk viscous coefficient, equation of state parameter, and energy conditions. Finally, we conclude our $f\left(Q,T\right)$\ cosmological models agree with the recent astronomical observations.

arXiv commentCJPHY accepted version

References in corpus (31)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Planck 2015 results. XIII. Cosmological parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
• f(R,T) gravity
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Coincident General Relativity
• Cosmology in $f(Q)$ geometry
• $f(Q,T)$ gravity
• Coupling matter in modified $Q$-gravity
• Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature
• Cosmic anti-friction and accelerated expansion
• Energy Conditions in $f(Q)$ gravity
• Cosmographic bounds on the cosmological deceleration-acceleration transition redshift in $f(\mathcal{R})$ gravity
• Accelerated Expansion of the Universe in Non-minimally Coupled Gravity
• Cosmography in $f(Q)$ gravity
• Cosmological model with viscosity media (dark fluid) described by an effective equation of state
• Friedmann model with viscous cosmology in modified $f(R,T)$ gravity theory
• Viscous dark energy and phantom evolution
• Enlarged quintessence cosmology
• $f(Q,T)$ gravity models with observational constraints
• Geodesic deviation, Raychaudhuri equation, Newtonian limit, and tidal forces in Weyl-type $f(Q,T)$ gravity
• Viscous FRW Cosmology in Modified Gravity
• Energy conditions in $f(Q,T)$ gravity
• Model parameters in the context of late time cosmic acceleration in $f(Q,T)$ gravity
• Rip cosmological models in extended symmetric teleparallel gravity
• Stability analysis of anisotropic Bianchi type-I cosmological model in teleparallel gravity
• Holographic dark energy in Gauss-Bonnet gravity with Granda-Oliveros cut-off
• Bianchi type-I Barrow holographic dark energy model in symmetric teleparallel gravity

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• Cosmological constraints in symmetric teleparallel gravity with bulk viscosity