Baryons from evaporating primordial black holes reduce primordial ^7Li abundance to observed values via neutron capture converting it to ^4He.
Re-examining the Lithium abun- dance problem in Big-Bang nucleosynthesis,
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Possible explanation of primordial $^7$Li deficit
Baryons from evaporating primordial black holes reduce primordial ^7Li abundance to observed values via neutron capture converting it to ^4He.