Solution to Big-Bang Nucleosynthesis in Hybrid Axion Dark Matter Model

TL;DR

This paper proposes a hybrid axion and supersymmetric particle model that resolves the Big-Bang Nucleosynthesis lithium problem while maintaining concordance with deuterium observations.

Contribution

It introduces a novel hybrid model combining axions and relic supersymmetric particles to address BBN discrepancies.

Findings

7Li abundance aligns with observations

Deuterium abundance remains consistent

Model preserves early universe nucleosynthesis concordance

Abstract

Following a recent suggestion of axion cooling of photons between the nucleosynthesis and recombination epochs in the Early Universe, we investigate a hybrid model with both axions and relic supersymmetric particles. In this model we demonstrate that the 7Li abundance can be consistent with observations without destroying the important concordance of deuterium abundance.