Modified GR and Helium Nucleosynthesis

TL;DR

This paper explores a cosmological model based on general relativity with non-zero divergence of the energy-momentum tensor, demonstrating its consistency with helium nucleosynthesis observations and extending it within the Randall-Sundrum brane framework.

Contribution

It introduces a modified cosmological model with a non-zero divergence in the energy-momentum tensor and shows its compatibility with helium nucleosynthesis data, including within brane-world scenarios.

Findings

Model aligns with observed helium abundance for certain parameters.

Incorporating the Randall-Sundrum brane model broadens parameter compatibility.

Supports viability of non-standard divergence models in cosmology.

Abstract

We show that a previously proposed cosmological model based on general relativity with non vanishing divergence for the energy-momentum tensor is consistent with the observed values for the nucleosynthesis of helium for some values of the arbitrary parameter $\alpha$ presented in this model. Further more values of $\alpha$ can be accommodated if we adopt the Randall-Sundrum single brane model.