An Enhanced Cosmological Li6 Abundance as a Potential Signature of
  Residual Dark Matter Annihilations
  Residual late-time dark matter particle annihilations during and after Big
Bang Nucleosynthesis (BBN) may alter the predicted cosmological abundances of
the light elements. Within the constrained minimal supersymmetric extension of
the Standard Model (the CMSSM) with a neutralino LSP, we find negligible
effects on the abundances of Deuterium, He3, He4 and Li7 predicted by
homogeneous BBN, but potentially a large enhancement in the predicted abundance
of Li6. This enhancement may be as much as two orders of magnitude in the
focus-point WMAP strip and in the coannihilation and funnel regions for large
tan beta for small m_{1/2}, and the effect is still significant at large
m_{1/2}. However, the potential Li6 enhancement is negligible in the part of
the coannihilation strip for tan beta = 10 that survives the latest LHC
constraints. A similar enhancement of the \li6 abundance may also be found in a
model with common, non-universal Higgs masses (the NUHM1).
