| Project/Area Number |
22K20367
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0203:Particle-, nuclear-, astro-physics, and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | Inflation / Black hole / Modified gravity / Dark energy / Magnetogenesis / Quasinormal Modes / Effective Field Theory / Vector-tensor Gravity / Wavecfunction / Resonant non-Gaussianity / Effective field theory / Regge-Wheeler equation / Gravitational wave |
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| Outline of Research at the Start |
The research outline is to study modified theories of gravity in various regimes in cosmology (dark energy, black hole and inflation) and to use the observations relevant to those regimes to constrain those modified gravity theories.
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| Outline of Final Research Achievements |
1. I successfully constructed a single effective description of black hole perturbations with timelike scalar profile. This allows us to extract an interesting phenomena due to modifications of gravity in the vicinity of black hole. This led to several publications.
2. I successfully computed the distribution function of a promordial field during inflation. This is important for studying the formation of primordial blakc holes.
3. I successfully constructed a model, describing the resonant production of magnetic field in the early universe. This explains the observed value of magnetic field on the intergalactic scales.
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| Academic Significance and Societal Importance of the Research Achievements |
1. The study of effective field theory provides a universal way to test theories of gravity in various scales of our Universe.
2. The study of the wavefunction of the Universe leads us to understand the non-perturbative feature that lies beyond our standard computation.
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