Abstract:Abstract. The plateau of 7 Li abundance as a function of the iron abundance by spectroscopic observations of metal-poor halo stars (MPHSs) indicates its primordial origin. The observed abundance levels are about a factor of three smaller than the primordial 7 Li abundance predicted in the standard Big Bang Nucleosynthesis (BBN) model. This discrepancy might originate from exotic particle and nuclear processes operating in BBN epoch. Some particle models include heavy (m 1 GeV) long-lived colored particles whic… Show more
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