Hadronic decay of late-decaying particles and big-bang nucleosynthesis

概要

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In this talk, we discuss the senario of big-bang nucleosynthesis (BBN) with late-decaying exotic particles with lifetime longer than 〜 0.1 sec. In the early universe, with such a late-decaying particle, predictions of the standard BBN scenario can be significantly altered. Compared with observation therefore, we can derive constraints on its primordial abundance. We pay particular attention to hadronic decay modes of such particles. We see that the non-thermal production process of D, ^3He and ^6Li provides a stringent upper bound on the primordial abundance of late-decaying particles.
素粒子論グループ素粒子研究編集部の論文
2005-01-20