Cosmological scenario of stop NLSP with gravitino LSP and the cosmic lithium problem

Understand

The discrepancy on Li^7 and Li^6 abundances between the observational data and the standard Big Bang Nucleosynthesis theory prediction has been a nagging problem in astrophysics and cosmology, given the highly attractive and succesful Big Bang paradigm.

• One possible solution of this lithium problem is through hadronic decays of a massive metastable particle which alter the primordial element abundances.
• We explore this possibility using gravitino dark matter framework in which the next lightest supersymmetric particle (NLSP) is typically long-lived.
• We found that stop NLSP can provide an attractive solution to the lithium problem.