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

1.我与向山真司教授在JCAP上发表了一篇关于“类时标量轮廓黑洞扰动的有效场论：公式化”的论文（YITP，京都）。我们提出的有效理论为研究黑洞扰动动力学提供了标量-张量理论的一般框架，并且可以应用于任意背景几何.我与向山真司教授和高桥和文博士在JCAP上发表了一篇关于“具有类时标量轮廓的黑洞扰动的有效场论的广义Regge-Wheeler方程”的论文（京都YITP）。利用有效理论研究了奇宇称微扰动力学，得到了广义Regge-Wheeler方程，它是确定拟正则模谱的中心方程.我与佐佐木美雄教授（东京大学）和瓦列里·瓦尔达尼扬博士（东京大学）一起写了一篇关于“暴胀期间的超视界共振磁生”的论文。该论文已被珠三角接受，即将出版。为了解释星系际尺度上的磁场观测值，我们提出了一种由暴胀产生原初磁场的新机制。我们得到了一个允许的参数范围，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反应等问题。

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.