| Project/Area Number |
23540327
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
KOHRI Kazunori 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (50565819)
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 宇宙論 / ダークマタ― / 超対称性粒子 / 長寿命超対称荷電粒子 / 超対称性理論 / ビッグバン元素合成 / ヒッグス / リチウム / 国際研究者交流 / アメリカ / イギリス / 元素合成 / 超対称性 / LHC |
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| Outline of Final Research Achievements |
During the period in which I have been supported by this grant, I have published 34 papers including a single concluding full-length paper. In response to the discovery of the Higgs particle in 2013, the parameter spaces of Minimal Supersymmetric Standard Models (MSSM) have been restricted severely. In order to fit the data of the relic
abundance of the cold dark matter which could be a particle in MSSM, and satisfy the conditions for the successful big-bang nucleosynthesis, the allowed parameter spaces have been severely shrunk or disappeared. However, we have shown that if we add a new singlet particle (singlino) into the MSSM model, the situation is changed. The singlino can become the cold dark matter, and the existence of the long-lived scalar tau lepton can solve both the Lithium 7 and Lithium 6 problems simultaneously in some parameter
spaces. By those achievements, we have summarized all of known important effects on cosmology induced by a long-lived charged massive particle.
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