Phantom dark energy nature of bulk-viscosity universe in modified f(Q)-gravity

Author:

Dixit Archana1,Maurya Dinesh Chandra2ORCID,Pradhan Anirudh3

Affiliation:

1. Department of Mathematics, Institute of Applied Sciences and Humanities, GLA University, Mathura 281 406, India

2. Center for Theoretical Physics and Mathematics, IASE (Deemed to be University), Sardarshahar 331 403 (Churu), Rajasthan, India

3. Centre for Cosmology, Astrophysics and Space Science, GLA University, Mathura 281 406, Uttar Pradesh, India

Abstract

This paper deals with an anisotropic cosmological model in the modified theory of [Formula: see text]-gravity filled with bulk-viscosity fluid. We investigated the modified [Formula: see text]-gravity with quadratic form [Formula: see text], where [Formula: see text] is the non-metricity scalar and [Formula: see text] is a positive constant, in Locally-Rotationally Symmetric (LRS) Bianchi type-[Formula: see text] space time universe. We have solved the modified Einstein’s field equations with bulk-viscosity factor [Formula: see text] and obtained average scale factor [Formula: see text] where [Formula: see text] is a constant and [Formula: see text], and [Formula: see text]. We have investigated the model in two cases [Formula: see text] and [Formula: see text]. We have found the best-fit values of model parameters with observational datasets like Union 2.1 compilation and Joint Light Curve Analysis (JLA) datasets by applying [Formula: see text]-test formula in curve-fitting. Using these best-fit values of model parameters, we have studied the cosmological parameter like Hubble parameter [Formula: see text] and deceleration parameter [Formula: see text], equation of state (EoS) parameter, age of the present universe [Formula: see text], etc. We have obtained a transit model (i.e. decelerating to accelerating in current) in the first case [Formula: see text] and a transit phase model from accelerating to decelerating in the second case [Formula: see text]. We have investigated the EoS parameter [Formula: see text] for bulk-viscosity and obtained the present values as [Formula: see text], which is supported by the observational results. We have also analyzed energy conditions and statefinder parameters and found that our model approaches to LCDM model in the future.

Publisher

World Scientific Pub Co Pte Ltd

Subject

Physics and Astronomy (miscellaneous)

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