New VLT observations of He I* absorbers yield a primordial ³He/⁴He ratio of (1.15^{+0.24}_{-0.21})×10^{-4} consistent with standard Big Bang nucleosynthesis, plus an updated stellar yield scaling factor.
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Intermediate-mass black holes acting as permanent matter sinks, combined with updated cosmic star formation rates and primordial baryon accretion, reduce the overpredicted CNO abundances from Population III stars to match observations in z~3-6 quasar absorption systems.
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Towards a measurement of the primordial helium isotope ratio
New VLT observations of He I* absorbers yield a primordial ³He/⁴He ratio of (1.15^{+0.24}_{-0.21})×10^{-4} consistent with standard Big Bang nucleosynthesis, plus an updated stellar yield scaling factor.
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On the relative CNO underabundance in quasar absorption systems at $z \sim 3$ arising from Population III enrichment and attenuation by intermediate-mass black holes and primordial baryon accretion
Intermediate-mass black holes acting as permanent matter sinks, combined with updated cosmic star formation rates and primordial baryon accretion, reduce the overpredicted CNO abundances from Population III stars to match observations in z~3-6 quasar absorption systems.