An FLRW accelerating universe model in Weyl type $f(Q)$ gravity and Observational Constraints

TL;DR

This paper develops a Weyl type $f(Q)$ gravity cosmological model that explains the universe's transition from deceleration to acceleration and fits well with multiple observational data sets.

Contribution

It introduces a specific functional form of $f(Q)$ gravity that models cosmic acceleration without dark energy and validates it against observational data.

Findings

Model fits well with Hubble and supernova data

Weyl vector dominance induces acceleration in dust-filled universe

Transition from deceleration to acceleration successfully modeled

Abstract

We propose to develop a cosmological model of the universe based on Weyl type $ f(Q) $ gravity which shows the transition from decelerating in the past to acceleration at present by considering a particular functional form of $ f(Q) $ gravity as $ f(Q) = ({H_0}^2) (\alpha_1 + \alpha_2 \hskip0.05in log ({H_0^{-2}} Q)) $. We have solved Weyl type $ f(Q) $ gravity field equations numerically and have obtained numerical solutions to the Hubble and deceleration parameters, distance modulus, and apparent magnitudes of stellar objects like SNIa Supernovae. We have also obtained numerical solutions for the Weyl vector $ w $, non-metricity scalar $ Q $, and the Lagrangian multiplier $ \lambda $ appearing in the action of $ f(Q) $ gravity. We have compared our theoretical solutions with the error bar plots of the Observed Hubble data set of $ 77 $ points, $ 580 $ distance modulus SNIa data set, and $ 1048 $ supernova Pantheon data sets of apparent magnitudes. It is found that our results fit well with the observed data set points. \bf{The model envisages a unique feature that although the universe is filled with perfect fluid as dust whose pressure is zero, still the weyl vector dominance f(Q) creates acceleration in it. }