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The ups and downs of inferred cosmological lithium
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I summarize the stellar side of the cosmological lithium problem(s). Evidence from independent studies is accumulating and indicates that stars may very well be fully responsible for lowering their surface lithium from the predicted primordial value to observed levels through internal element-transport mechanisms collectively referred to as atomic diffusion. While atomic diffusion can be modelled from first principles, stellar evolution uses a parametrized representation of convection making it impossible to predict convective-boundary mixing as a vital stellar process moderating atomic diffusion. More work is clearly needed here for a fully quantitative picture of lithium (and metallicity) evolution as stars age. Lastly, note that inferred stellar lithium-6 abundances have all but disappeared.
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Photo- and Hadrodisintegration constraints on massive relics decaying into neutrinos
Decays of heavy relic particles into neutrinos are far more constrained by Big Bang nucleosynthesis than previously thought, once neutrino-neutrino scattering and hadrodisintegration are included.
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