2017 Fiscal Year Final Research Report
Study of inflationary universe
| Project/Area Number |
26400239
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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 | The University of Tokyo |
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Principal Investigator |
Moroi Takeo 東京大学, 大学院理学系研究科(理学部), 教授 (60322997)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Keywords | 素粒子論的宇宙論 / インフレーション / 真空崩壊 |
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| Outline of Final Research Achievements |
In this project, inflationary universe has been studied based on most recent precise observation of our universe. In particular, the most important progresses are (1) the study of the beyond-the-standard-model (BSM) physics based on big-bang nucleosynthesis (BBN), and (2) the study of metastable vacuum.
For the BBN constraints on the BSM physics, constraints on the properties of long-lived particles have been derived in order not to spoil the success of the BBN scenario. In addition, upper bound on the reheating temperature after inflation has been derived in order not to overproduce gravitino in supersymmetric model.
For the decay rate of the metastable vacuum, a gauge invariant formulation of the calculation of the decay rate, which has not been known before, has been proposed. Then, such a formulation has been applied to the calculation of the decay rate of the electroweak vacuum in the standard model.
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| Free Research Field |
素粒子理論
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