Testing Theories of Gravity in Various Regimes in Cosmology with Gravitational Wave
| 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 |
Granted (Fiscal Year 2022)
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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 | Effective field theory / Regge-Wheeler equation / Magnetogenesis / Modified gravity / Gravitational wave / Dark energy / Inflation / Black hole |
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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 Annual Research Achievements |
1. I have published a paper on "Effective field theory of black hole perturbations with timelike scalar profile: formulation" in JCAP with Prof.Shinji Mukohyama (YITP, Kyoto). The effective theory we formulated provides a general framework in the context of scalar-tensor theories for studying dynamics of black hole perturbations, and can be applied to an arbitrary background geometry.
2. I have published a papaer on "Generalized Regge-Wheeler equation from Effective Field Theory of black hole perturbations with a timelike scalar profile" in JCAP with Prof.Shinji Mukohyama and Dr.Kazufumi Takahashi (YITP, Kyoto). We used the effetive theory to study dynamics of odd-parity perturbations and obtained the generalized Regge-Wheeler equation which is a central equation to determine the spectrum of quasinormal modes.
3. I have written a paper on "Super-horizon resonant magnetogenesis during inflation" with Prof.Misao Sasaki (IPMU, Tokyo) and Dr.Valeri Vardanyan (IPMU, Tokyo). The paper has been accepted in PRD and will be published soon. We proposed a novel mechanism for generating a primordial magnetic field from inflation in order to explain the observed value of magnetic field on the intergalactic scale. We obtained an allowed region of our parameters for which we can explain the observed value of magnetic field, and also avoid the problems such as the strong coupling and the backreaction problems.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The fact that the project on the primordial magnetogenesis requires a careful analysis both analytically and numerically affected the submission date of the paper. On top of that, since the backreaction problem plays an important role, we then spent a lot of time trying to evade this problem.
Apart from the project number 3, the other two projects went smoothly as planned, and there was no delay for publications.
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| Strategy for Future Research Activity |
1. I am planing to finish the paper on quasinormal mode spectrum from the EFT of black hole perturbations with Prof.Shinji Mukohyama, Dr.Kazufumi Takahashi and Dr.Keitaro Tomikawa. We are at the final stage of the project and we are planing to submit to the journal soon.
2. I am planing to finish the paper on effective field theory of vector-tensor theories on black hole background with Dr.Katsuki Aoki (YITP), Dr.Mohammad Ali Gorji (ICC, Barcelona), Prof.Shinji Mukohyama and Dr.Kazufumi Takahashi. The project is now progressing and we are planning to submit the paper to the journal within this year.
3. I am planing to finish the paper on Resonant Features in Inflation Beyond Perturbation Theory with Prof.Paolo Creminelli (ICTP, Trieste), Prof.Sebastien Renaux-Petel (IAP, Paris) and Dr.Giovanni Tambalo (Max Planck, Potsdam). The project is now at the final stage and we planning to submit the paper to the journal within this year.
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Report
(1 results)
Research Products
(8 results)
