  The light elements up to 7Li were produced by the Standard Big Bang
nucleosynthesis (SBBN) in the early universe assuming standard conditions. All
observed primordial abundances of these light elements match very well the
predicted ones by this SBBN except for 7Li which seems to be overproduced. It
is rather challenging to resolve this discrepancy owing to the diverse
possibilities affecting the abundance of lithium. In the present work we focus
on non-standard possible solutions such as variation of chemical potential and
the neutrino temperatures. In addition, the effect of dark matter is also
analysed. We find that including these non-standard assumptions helps to reduce
the abundance of lithium as predicted by SBBN. We suggest that this could be a
possible step toward resolving the lithium problem.
