Cosmological model in f(Q) theory of gravity.

Kumar Shukla, Bhupendra; Sofuoğlu, Değer; Beesham, A.; Mishra, Preeti

In the context of symmetric teleparallel modified gravity, known as f (Q) theory, we examine an accelerating cosmological model using a log-square-root form of the non-metricity function. Solving the field equations with a parametrized deceleration parameter in terms of redshift, we derive the model parameters. Our analysis utilizes data from 57 Hubble observations, 1048 Pantheon supernovae, and BAO datasets, with a Markov Chain Monte Carlo (MCMC) technique for statistical analysis. The results show that the deceleration parameter transitions from positive (early deceleration) to negative (current acceleration), aligning with observational data. Statefinder parameters indicate that the model evolves from quintessence-like behavior to convergence with the Λ CDM model. The equation of state parameter suggests a phantom dark energy scenario, implying faster-than-expected acceleration. The matter density and cosmic pressure predictions are consistent with observational trends. We can conclude that the f (Q) gravity model offers a robust framework for explaining the accelerated expansion of the universe, providing a viable alternative to the Λ CDM model, and highlighting the potential of non-metric gravity theories to advance our understanding of dark energy and cosmic dynamics.

MARKOV chain Monte Carlo; EQUATIONS of state; GRAVITY; STATISTICS; DARK energy; DATA analysis

Modern Physics Letters A, 2024, Vol 39, Issue 38, p1

0217-7323

Academic Journal

10.1142/S0217732324501773