COSMOLOGICAL ANALYSIS OF A SIMPLE ????(????) MODIFIED GRAVITY MODEL

Abstract

In this work, we study a simple modified gravity model within the framework of f (R) theory to understand the expansion history of the universe. By considering a power-law form of the scale factor, the cosmological parameters are derived and ex-pressed in terms of redshift. The model is then constrained using observational data from Cosmic Chronometers (CC) and Baryon Acoustic Oscillations (BAO) through a chi-square minimization technique. The results show that the model provides a good agreement with observational data, particularly for the CC dataset, and predicts a behavior close to a coasting universe with slight indications of acceleration. A comparison with the standard ΛCDM model reveals consistency at low redshift, with deviations at higher redshift. Overall, the model offers a simple and viable alternative framework to describe the cosmic expansion.