Big-Bang nucleosynthyesis: constraints on nuclear reaction rates, neutrino degeneracy, inhomogeneous and Brans-Dicke models

TL;DR

This paper reviews recent advances in Big-Bang nucleosynthesis, examining standard and non-standard cosmological models, neutrino effects, inhomogeneities, and alternative gravity theories like Brans-Dicke, constraining related parameters.

Contribution

It provides a comprehensive analysis of how different theoretical modifications impact nucleosynthesis and constrains their parameters based on recent progress.

Findings

Constraints on neutrino degeneracy parameters

Limits on inhomogeneity in nucleosynthesis models

Bounds on Brans-Dicke theory parameters

Abstract

We review the recent progress in the Big-Bang nucleosynthesis which includes the standard and non-standard theory of cosmology, effects of neutrino degeneracy, and inhomogeneous nucleosynthesis within the framework of a Friedmann model. As for a non-standard theory of gravitation, we adopt a Brans-Dicke theory which incorporate a cosmological constant. We constrain various parameters associated with each subject.