Impact of Neutrino Properties and Dark Matter on the Primordial Lithium Production

Understand

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.