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Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies

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arxiv 2206.00693 v2 pith:FMA7DLRP submitted 2022-06-01 hep-ph astro-ph.CO

Anne-Katherine Burns , Tim M.P. Tait , Mauro Valli This is my paper · ORCID
classification hep-phastro-ph.CO
keywords asymmetryleptonearlyempgsextremelygalaxiesindicationsmeasurement
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abstract

The recent measurement of helium-4 from the near-infrared spectroscopy of extremely metal-poor galaxies (EMPGs) by the Subaru Survey may point to a new puzzle in the Early Universe. We exploit this new helium measurement together with the percent-level determination of primordial deuterium, to assess indications for a non-vanishing lepton asymmetry during the Big Bang Nucleosynthesis (BBN) era, paying particular attention to the role of uncertainties in the nuclear reaction network. A cutting-edge Bayesian analysis focused on the role of the newly measured EMPGs, jointly with information from the Cosmic Microwave Background, suggests the existence of a nonzero lepton asymmetry at around the $2 \sigma$ level, providing a hint for cosmology beyond $\Lambda$CDM. We discuss conditions for a large total lepton asymmetry to be consistently realized in the Early Universe.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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    A transient expansion-rate boost during deuterium burning can reconcile the measured deuterium abundance with the high baryon density preferred by early dark energy models, without changing helium-4.

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    A combined fit of EMPRESS, DESI BAO, and CMB data prefers a neutrino asymmetry xi_nu = 0.056 +/- 0.017 and extra radiation delta_Neff = 0.41 +/- 0.16 in a neutrinophilic LambdaCDM model.

  4. Impact of light sterile neutrinos on cosmological large scale structure

    astro-ph.CO 2025-01 conditional novelty 4.0 of 10

    Sterile neutrinos suppress the matter power spectrum and halo mass and velocity functions while increasing halo pairwise infall velocities, with effects up to tens of percent for the most massive cases studied.

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