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Hidden universality in the merger rate distribution in the primordial black hole scenario
Bence Kocsis, Teruaki Suyama, Takahiro Tanaka +1
It has been proposed that primordial black holes (PBHs) form binaries in the radiation dominated era. Once formed, some fraction of them may merge within the age of the Universe by…
Statistical nature of infrared dynamics on de Sitter background
Junsei Tokuda, Takahiro Tanaka
In this study, we formulate a systematic way of deriving an effective equation of motion(EoM) for long wavelength modes of a massless scalar field with a general potential o…
Large gauge transformation, Soft theorem, and Infrared divergence in inflationary spacetime
Takahiro Tanaka, Yuko Urakawa
It is widely known that the primordial curvature perturbation has several universal properties in the infrared (IR) such as the soft theorem, which is also known as the consist…
Black hole ringdown echoes and howls
Hiroyuki Nakano, Norichika Sago, Hideyuki Tagoshi +1
Recently the possibility of detecting echoes of ringdown gravitational waves from binary black hole mergers was shown. The presence of echoes is expected if the black hole is surro…