Non-Thermal Cosmic Rays During Big Bang Nucleosynthesis to Solve the
  Lithium Problem
  The discrepancy between the theoretical prediction of primordial lithium
abundances and astronomical observations is called the Lithium Problem. We find
that extra contributions from non-thermal hydrogen and helium during Big Bang
nucleosynthesis can explain the discrepancy, for both Li-7 and Li-6, and will
change the deuterium abundance only little. The allowed parameter space of such
an amount of non-thermal particles and the energy range is shown. The
hypothesis is stable regardless of the cross-section uncertainty of relevant
reactions and the explicit shape of the energy spectrum.
