Did Something Decay, Evaporate, or Annihilate during Big Bang Nucleosynthesis?
نویسنده
چکیده
Results of a detailed examination of the cascade nucleosynthesis resulting from the putative hadronic decay, evaporation, or annihilation of a primordial relic during the Big Bang nucleosynthesis (BBN) era are presented. It is found that injection of energetic nucleons around cosmic time 10sec may lead to an observationally favored reduction of the primordial Li/H yield by a factor 2 − 3. Moreover, such sources also generically predict the production of the Li isotope with magnitude close to the as yet unexplained high Li abundances in low-metallicity stars. The simplest of these models operate at fractional contribution to the baryon density Ωbh 2 >
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