Compatibility of big bang nucleosynthesis in some modified gravities

This paper is devoted to investigate the implications of Einstein-Aether and modified Horava-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 T-f with the Lambda CDM paradigm and use observational bounds on vertical bar Delta T-f/T-f vertical bar 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 Horava-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.

Automated summary

This paper investigates the implications of Einstein-Aether and modified Horava-Lifshitz theories of gravity on big bang nucleosynthesis. By comparing the models with observational bounds, it is found that the chosen gravity models satisfy the constraints of big bang nucleosynthesis, making them viable cosmological models.