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Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies
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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.
Forward citations
Cited by 2 Pith papers
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Boomerang mechanism explaining the excess radio background
A two-stage mechanism where relic neutrinos convert to dark neutrinos in the early universe and later decay into photon states can explain the ARCADE 2 excess radio background while evading neutrino magnetic moment bounds.
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What could an emerging Big Bang Nucleosynthesis discrepancy be hinting at?
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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