Bulk Viscous Fluid in Symmetric Teleparallel Cosmology: Theory versus Experiment

The standard formulation of General Relativity Theory, in the absence a cosmological constant, is unable to explain responsible mechanism for observed late-time cosmic acceleration. On other hand, by inserting constant Einstein's field equations it possible describe acceleration, but suffers from an unprecedented fine-tunning problem. This motivates one modify space-time geometry Relativity. $f(Q)$ modified theory gravity alternative Relativity, where non-metricity scalar $Q$ candidate gravitational interactions. In present work we consider Friedmann-Lem\^aitre-Robertson-Walker model dominated bulk viscous fluid with functional form $f(Q)=\alpha Q^n$, $\alpha$ and $n$ are free parameters model. We constrain our recent Pantheon supernovae data set 1048 points, Hubble 31 points baryon acoustic oscillations consisting six points. For higher values redshift, clear that cosmology better fits than cosmology. evolution deceleration parameter redshift properly predicts transition decelerated accelerated phases universe expansion. Also, density, pressure effective equation state redshift. Those show viscosity valid acquire negative drive expansion efficiently.We also examine behavior different energy conditions test viability Furthermore, statefinder diagnostics investigated order distinguish among dark models.