2023 Fiscal Year Annual Research Report
Testing Theories of Gravity in Various Regimes in Cosmology with Gravitational Wave
| Project/Area Number |
22K20367
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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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| Keywords | Quasinormal Modes / Effective Field Theory / Vector-tensor Gravity / Wavecfunction / Resonant non-Gaussianity |
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| Outline of Annual Research Achievements |
1. I have published a paper on Quasinormal modes from EFT of black hole perturbations with timelike scalar profile in JCAP with Prof.Shinji Mukohyama (YITP), Dr.Kazufumi Takahashi (YITP) and Dr.Keitaro Tomikawa (Rikkyo). This is the first phenomenological application of the effective field theory of black hole perturbations I have constructed with Prof.Shinji Mukohyama. In fact, this allows us to test theories of gravity in the strong gravity regime.
2. I have published a paper on Effective field theory of black hole perturbations in vector-tensor gravity in JCAP with Dr.Katsuki Aoki (YITP), Dr.Mohammad Ali Gorji (ICC, Barcelona), Prof.Shinji Mukohyama and Dr.Kazufumi Takahashi. This EFT can be used to describe dynamics of perturbations including gravitational waves in an arbitrary background.
3. I have published a paper on Non-perturbative wavefunction of the universe in inflation with (resonant) features in JHEP with Prof.Paolo Creminelli (ICTP, Trieste), Prof.Sebastien Renaux-Petel (IAP, Paris) and Dr.Giovanni Tambalo (Max Planck, Potsdam). This work shows a non-perturbative feature of the wavefunction of the universe in the large field limit, which cannot be captured by any order in perturbation theory.
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