宇宙の再加熱温度とニュートリノ宇宙背景放射の熱化(素粒子物理学の新展開,研究会報告)

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概要

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• Late-time reheating process due to the decay of non-relativistic massive particles influences the scenario of the standard cosmology. If the matter-dominated epoch continues so long that the radiation-domination can not be realized completely at a cosmic time t≃1 sec, the universe would fail to produce the light elements. We find that the reheating temperature T_R should be greater than 0.7 MeV in order to agree with observations. If the massive particle has a branch of hadronic decay mode, the reheating temperature should be greater than 3 - 4 MeV, for the hadronic branching ratio B_h = 10^<-2> - 1. It is expected that the future satellite experiments (MAP and PLANCK) to measure anisotropies of cosmic microwave background radiation temperature can detect the vestige of the late-time entropy production as a modification of the effective number of the neutrino species N^<eff>_v.

• 2001-01-20

著者

• 郡 和範

  京大理

• 郡 和範

  大阪大学大学院理学研究科宇宙地球科学専攻宇宙進化グループ

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