Impact of big bang nucleosynthesis on the H0 tension

TL;DR

This paper examines how different treatments of big bang nucleosynthesis data influence the assessment of the Hubble tension, revealing that methodological choices can alter the tension's significance by nearly one sigma.

Contribution

It highlights the importance of analysis assumptions in BBN data treatment and their impact on the evaluation of the Hubble tension.

Findings

The significance of the Hubble tension varies by 0.8 sigma depending on BBN data treatment.

Methodological choices in BBN analysis significantly affect the perceived tension.

Careful consideration of BBN data inclusion is crucial for accurate Hubble tension assessment.

Abstract

We investigate the impact of big bang nucleosynthesis (BBN) on the Hubble tension, focusing on how the treatment of the reaction rate and observational data affect the evaluation of the tension. We show that the significance of the tension can vary by $0.8 \sigma$ in some early dark energy model, depending on the treatment of the reaction rate and observational data. This indicates that how we include the BBN data in the analysis can give a significant impact on the Hubble tension, and we need to carefully consider the assumptions of the analysis to evaluate the significance of the tension when the BBN data is used.