Testing Theories of Gravity in Various Regimes in Cosmology with Gravitational Wave

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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.