What could an emerging Big Bang Nucleosynthesis discrepancy be hinting at?

arXiv:2607.20635 · astro-ph.CO, hep-ph · Submitted 2026-07-22 · Read on arXiv

Vivian Poulin, Julien Froustey, Cyril Pitrou, Tristan L. Smith

astro-ph.CO, hep-ph

Submitted: 2026-07-22

Comments: 14 pages, 8 figures. Comments welcome!

Code: https://github.com/CyrilPitrou/primat

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Abundance — 59× in this paper · explained in 1 episode
• Hubble Tension — 10× in this paper · explained in 9 episodes
• Consistency — 7× in this paper · explained in 3 episodes
• Big Bang Nucleosynthesis — 5× in this paper
• Matter Power Spectrum — 2× in this paper · explained in 2 episodes
• Adam — 1× in this paper · explained in 2 episodes
• Benchmark — 1× in this paper · explained in 2 episodes
• Benchmarking — 1× in this paper · explained in 3 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• Precision big bang nucleosynthesis with improved Helium-4 predictions
• PArthENoPE Revolutions
• The Impact of New d(p,\gamma)He3 Rates on Big Bang Nucleosynthesis
• Primordial Deuterium after LUNA: concordances and error budget
• A new tension in the cosmological model from primordial deuterium?
• PRyMordial: The First Three Minutes, Within and Beyond the Standard Model
• A data-driven prediction for the primordial deuterium abundance
• Resolving conclusions about the early Universe requires accurate nuclear measurements
• The Cosmological Evolution of the Average Mass Per Baryon
• One percent determination of the primordial deuterium abundance
• A New Precise Determination of the Primordial Abundance of Deuterium: Measurement in the metal-poor sub-DLA system at z=3.42 towards quasar J1332+0052
• The 2024 BBN baryon abundance update
• CMB power spectra and cosmological parameters from Planck PR4 with CamSpec
• The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and $\Lambda$CDM Parameters
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• Incomplete neutrino decoupling effect on big bang nucleosynthesis
• The LBT Y$_\mathrm{p}$ Project IV: A New Value of the Primordial Helium Abundance
• The LBT $Y_{\rm p}$ Project V: Cosmological Implications of a New Determination of Primordial $^4$He
• EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
• EMPRESS. XV. A New Determination of the Primordial Helium Abundance Suggesting a Moderately Low $Y_\mathrm{P}$ Value

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