Regular Article - Theoretical Physics
Compatibility of big bang nucleosynthesis in some modified gravities
Department of Mathematics, COMSATS University Islamabad, Lahore Campus, 54000, Lahore, Pakistan
2 Department of Mathematics, University of Okara, 56300, Okara, Pakistan
Accepted: 23 September 2022
Published online: 12 October 2022
This paper is devoted to investigate the implications of Einstein-Aether and modified Hořava–Lifshitz theories of gravity to the formation of light elements in the early universe named as big bang nucleosynthesis. We choose different models from these theories for a detailed investigation of big bang nucleosynthesis epoch and compare it with the observational bounds. That is, we compare the deviation of freeze-out temperature with the CDM paradigm and use observational bounds on to inspect constraints on the involved free parameters of these models. We apply Chi-square test on the Hubble parameter H in each model to analyze the compatibility of model parameters with the observations and find consistent results. We find that chosen models of Einstein-Aether gravity and modified Hořava–Lifshitz gravity can satisfy big bang nucleosynthesis constraints and thus constitute a viable cosmology since they can be source for dark energy sector and late-time accelerated expansion.
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