Hadronic decay of a massive particle and big bang nucleosynthesis

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概要

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• In this talk, I consider the effects on big bang nucleosynthesis (BBN) of the hadronic decay of a long-lived massive particle. If high-energy hadrons are emitted near the BBN epoch (t〜10^<-2>-10^2 sec), they extraordinarily inter-convert the background nucleons each other even after the freeze-out time of the neutron to proton ratio. Then, produced light element abundances are changed, and that may result in a significant discrepancy between standard BBN and observations. Especially on the theoretical side, now we can obtain a lot of experimental data of hadrons and simulate the hadronic decay process executing the numerical code of the hadron fragmentation even in the high energy region where we have no experimental data. Using the computed light element abundances in the hadron-injection scenario, we derive a constraint on properties of such a particle by comparing our theoretical results with observations.

• 素粒子論グループ 素粒子研究編集部の論文
• 2002-01-20

著者

• Kohri Kazunori

  Yukawa Institute For Theoretical Physics Kyoto University

関連論文

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• Features of Neutrino Signals from Collapsars
• Quintessence Cosmology and Varying α
• Hadronic decay of a massive particle and big bang nucleosynthesis

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