☆ 4.5 Article

Cosmic acceleration with bulk viscosity in modified f(Q) gravity

PHYSICS OF THE DARK UNIVERSE (2021)

Journal

PHYSICS OF THE DARK UNIVERSE

Volume 32, Issue -, Pages -

Publisher

ELSEVIER

DOI: 10.1016/j.dark.2021.100820

Keywords

f(Q) gravity; Bulk viscosity; Hubble data; Pantheon data; BAO data; Equation of state; Statefinder parameter

Funding

University Grants Commission (UGC) , New Delhi, India [191620096030]
CSIR, New Delhi, India [03 (1454) /19/EMR-II Dt.02/08/2019]

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Abstract

This article investigates the role of bulk viscosity in studying the accelerated expansion of the universe within the framework of modified f(Q) gravity. Differentiating two sets of limiting conditions on bulk viscous parameters and model parameter alpha, it is found that one condition supports the current scenario of cosmic acceleration and agrees well with observations. The study also includes analysis of cosmological behavior of geometrical parameters, constrained model parameters with observational datasets, and statefinder diagnostic analysis to reveal interesting results.

In this article, we have investigated the role of bulk viscosity to study the accelerated expansion of the universe in the framework of modified f(Q) gravity. The gravitational action in this modified gravity theory has the form f (Q), where Q denote the non-metricity scalar. In the present manuscript, we have considered a bulk viscous matter-dominated cosmological model with the bulk viscosity coefficient (H) of the form xi = xi(0) + xi H-1 + xi(2) ((H)over dot/H + H) which is proportional to the velocity and acceleration of the expanding universe. Two sets of limiting conditions on the bulk viscous parameters xi(0), xi(1), xi(2) and model parameter alpha arose here out of which one condition favors the present scenario of cosmic acceleration with a phase transition and corresponds to the universe with a Big Bang origin. Moreover, we have discussed the cosmological behavior of some geometrical parameters. Then, we have obtained the best fitting values of the model parameters xi(0), xi(1), xi(2) and alpha by constraining our model with updated Hubble datasets consisting of 57 data points and recently released Pantheon datasets consisting of 1048 data points which show that our obtained model has good compatibility with observations. Further, we have also included the Baryon Acoustic Oscillation (BAO) datasets of six data points with the Hubble & Pantheon datasets and obtained slightly different values of the model parameters. Finally, we have analyzed our model with the statefinder diagnostic analysis and found some interesting results and are discussed in details. (C) 2021 Elsevier B.V. All rights reserved.

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Bulk Viscous Fluid in Symmetric Teleparallel Cosmology: Theory versus Experiment

Raja Solanki, Simran Arora, Pradyumn Kumar Sahoo, Pedro H. R. S. Moraes

Summary: The standard formulation of General Relativity Theory fails to explain the observed late-time cosmic acceleration, while modifying Einstein's spacetime geometry in f(Q) gravity theory can effectively describe the acceleration and predict the transition from deceleration to acceleration. By constraining the model with observational data, the f(Q) cosmological model is found to be capable of accurately describing the universe's expansion and the behavior of cosmic fluid, and passes various tests of viability and distinguishability among dark energy models.

UNIVERSE (2023)