| Project/Area Number |
02640213
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
YANAGIDA Tsutomu (1991-1992) Tohoku University, 理学部, 教授 (10125677)
川崎 雅裕 (1990) 東北大学, 理学部, 助手 (50202031)
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| Co-Investigator(Kenkyū-buntansha) |
MURAYAMA Hitoshi 東北大学, 理学部, 助手 (20222341)
KAWASAKI Masahiro 東北大学, 理学部, 助手 (50202031)
柳田 勉 東北大学, 理学部, 教授 (10125677)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Cosmic Background radiation / Decay of Unstable Particle / Inflation Universe / Right-Handed Neutrino / Supersymmetry / Universe's Baryon Number / COBE / Solar Neutrino Problem / ニュ-トリノ / 宇宙論 / 輻射過程 / WIMPs |
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| Research Abstract |
(1) In 1990, we calculated the distortion of cosmic background radiation caused by the radiative decays of unstable particles. We drived a constraint on the mass and life time of the unstable particles using the limit of the distortion.
(2) In 1992, we constructed a chaotic inflation model which naturally explains the observed fluctuation of the cosmic background radiation. In this model the inflaton is a superpartner of the right-handed neutrino and hence this model is the first example which connects the inflation model and the particle physics. We, furthermore, found that the decay of the inflaton can explain the cosmic baryonnumber asymmetry.
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