A light particle solution to the cosmic Lithium problem
Andreas Goudelis, HEPHY – Vienna
Nicolás Bernal, ICTP-SAIFR
Big Bang Nucleosynthesis (BBN) is a cornerstone of modern cosmology. Standard BBN successfully predicts the abundances of the lightest elements in the universe, namely Deuterium and Helium. However, its prediction for the abundance of Lithium-7 overshoots the corresponding value inferred from the atmospheres of Pop-II stars by a factor 2-5. In this talk, I will show that light light, electrically neutral particles that have substantial interactions with nucleons can resolve this “cosmic lithium problem” while providing interesting signatures in intensity frontier experiments.