Computation of bulk viscous pressure with observational constraints via scalar field in the General relativity and f(Q) gravity

Abstract

The present article deals with the isotropic cosmological model of $f\left(Q\right)$ gravity filled with bulk viscous fluid, where $Q$ is the non-metricity term and it is responsible for the gravitational interaction. Aside from the tachyon and quintessence scalar fields, the modified Einstein’s field equations have been resolved through the application of the power law form of the expansion. In this model, the Markov chain Monte Carlo (MCMC) analysis method has been utilized to obtained the best-fit value of the model parameter and it confirms that the model satisfies the recent observational data. We have also examined the EoS parameter for bulk viscosity in these cosmological contexts and it has been determined that ${\omega }_{eff}$ will be located in the phantom region. The correspondence between bulk pressure and the reconstructed ${\omega }_{rec,Q}$ in f(Q) gravity has also been addressed. In the presence of holographic Ricci dark energy, the reconstructed $f\left(Q\right)$ gravity yields a transition from the quintessence era into phantom era.