| Project/Area Number |
20F20320
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
|
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
山口 昌英 東京工業大学, 理学院, 特定教授 (80383511)
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| Co-Investigator(Kenkyū-buntansha) |
KORUMILLI SRAVAN KUMAR 東京工業大学, 理学院, 外国人特別研究員
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| Project Period (FY) |
2020-11-13 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2022: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2021: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2020: ¥300,000 (Direct Cost: ¥300,000)
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| Keywords | non-local theory / non-local theory |
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| Outline of Research at the Start |
本研究では、重力理論を既存の枠組みを超えて非局所的に拡張し、その理論の理論的そして現象論的な側面に焦点をあてて研究を行います。より具体的には、非局所重力理論の枠組みで、超重力理論がどのように修正されるか、パリティーを破るような非局所理論はどのようになるか、また、インフレーション宇宙における揺らぎの相関関数の情報を通じて観測的にどのように非局所理論を検証できるか等について調べます。
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| Outline of Annual Research Achievements |
The R2 inflation which is an extension of general relativity (GR) by quadratic scalar curvature introduces a quasi-de Sitter expansion of the early Universe governed by Ricci scalar being an eigenmode of d’Alembertian operator. He derived a most general theory of gravity admitting R2 inflationary solution which turned out to be higher curvature non-local extension of GR. He studied in detail inflationary perturbations in this theory and analysed the structure of form factors that leads to a massive scalar (scalaron) and massless tensor degrees of freedom. He argued that the theory contains only finite number of free parameters which can be fixed by cosmological observations. He derived predictions of our generalized non-local R2-like inflation and obtain the scalar spectral index ns is 1 - 2/N and any value of the tensor-to-scalar ratio r < 0.036. In this theory, tensor spectral index can be either positive or negative and the well-known consistency relation is violated in a non-trivial way. He also computed running of the tensor spectral index and discussed observational implications to distinguish this model from several classes of scalar field models of inflation. These predictions allow us to probe the nature of quantum gravity in the scope of future CMB and gravitational wave observations.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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