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Bhagat R.
Investigating late-time cosmic acceleration in the extended symmetric teleparallel equivalent of general relativity / Bhagat R., Lohakare S. V., Mishra B. - Текст на англ. языке // Физические интерпретации теории относительности, Международная научная конференция 24-я, Москва, 7 - 10 июля 2025 г. = Physical Interpretations of Relativity Theory (PIRT–2025) : сборник тезисов / МГТУ им. Н. Э. Баумана. - М., 2025. -
The accelerated expansion of the Universe remains a fundamental challenge in modern cosmology, often attributed to dark energy within the ΛCDM framework. However, issues such as fine-tuning and the cosmic coincidence problem motivate the exploration of alternative theories. This study investigates late-time cosmic acceleration within the framework of (, ) gravity, a modified gravity theory where gravity is governed by nonmetricity instead of curvature or torsion. We formulate the field equations for (, ) gravity and derive a specific model parameterized by and . The model is constrained using observational data from Cosmic Chronometers (CC), and the Pantheon+ Supernova dataset. We employ Bayesian inference with a Markov Chain Monte Carlo (MCMC) approach to estimate key cosmological parameters, including the Hubble constant, and the model-specific parameters and . The results are compared against ΛCDM using statistical criteria such as Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC). Our findings suggest that (, ) gravity can provide a viable explanation for cosmic acceleration while offering insights into the nature of dark energy.
