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

1. 在JCAP上与京都YITP的木山真司教授共同发表了一篇论文《具有类时标量轮廓的黑洞摄动的有效场论：公式》。我们提出的有效理论为研究黑洞微扰动力学提供了标量张量理论的一般框架，并可应用于任意背景几何。我与shinji Mukohyama教授和kazufumi Takahashi博士（京都YITP）在JCAP上发表了一篇关于“类时标量轮廓黑洞扰动有效场论的广义Regge-Wheeler方程”的论文。利用有效理论研究了奇偶对微扰的动力学，得到了广义Regge-Wheeler方程，该方程是确定拟正态谱的中心方程。我曾与佐佐木misao教授（IPMU, Tokyo）和valeri Vardanyan博士（IPMU, Tokyo）共同撰写了一篇关于“暴胀期间的超视界共振磁生”的论文。论文已被珠三角接受，并将于近期出版。我们提出了一种由暴胀产生原始磁场的新机制，以解释星系间尺度上磁场的观测值。我们得到了一个参数允许的范围，在这个范围内我们可以解释磁场的观测值，同时也避免了强耦合和反作用等问题。

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.