Impact of big bang nucleosynthesis on the H0 tension

Tomo Takahashi; Yo Toda

Impact of big bang nucleosynthesis on the H0 tension

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arxiv 2306.00454 v1 pith:EJSKFYD3 submitted 2023-06-01 astro-ph.CO gr-qchep-ph

Tomo Takahashi , Yo Toda This is my paper

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keywords tensiondataimpactanalysisbanghubblenucleosynthesisobservational

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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.

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Beyond LambdaCDM: How the Hubble tension challenges early universe physics
astro-ph.CO 2025-07 reject novelty 2.0 of 10

An Early Dark Energy model can fit H0=73.56 km/s/Mpc only with a high EDE fraction and high peak redshift, while Bayesian evidence favors the model only in a narrow, finely-tuned parameter space.

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