242 citations · 2.3k across the 31 of their papers we have counts for
6 papers · 1 filter
NANOGrav results and LIGO-Virgo primordial black holes in axion-like curvaton model
Keisuke Inomata, Masahiro Kawasaki, Kyohei Mukaida +1
We discuss a possible connection between the recent NANOGrav results and the primordial black holes (PBHs) for the LIGO-Virgo events. In particular, we focus on the axion-like curv…
Analytic solutions of scalar perturbations induced by scalar perturbations
Keisuke Inomata
We study scalar perturbations induced by scalar perturbations through the non-linear interaction appearing at second order in perturbations. We derive analytic solutions of the ind…
Standard Model Prediction for Cosmological 21cm Circular Polarization
Lingyuan Ji, Marc Kamionkowski, Keisuke Inomata
Before cosmic reionization, hydrogen atoms acquire a spin polarization quadrupole through interaction with the anisotropic 21-cm radiation field. The interaction of this quadrupole…
Window function dependence of the novel mass function of primordial black holes
Koki Tokeshi, Keisuke Inomata, Jun'ichi Yokoyama
We investigate the ambiguity of the novel mass function of primordial black holes, which has succeeded in identifying the black hole mass in a given configuration of fluctuations,…
Gravitational Wave Production right after a Primordial Black Hole Evaporation
Keisuke Inomata, Masahiro Kawasaki, Kyohei Mukaida +2
We discuss the footprint of evaporation of primordial black holes (PBHs) on stochastic gravitational waves (GWs) induced by scalar perturbations. We consider the case where PBHs on…
Gauge Independence of Induced Gravitational Waves
Keisuke Inomata, Takahiro Terada
We study gauge (in)dependence of the gravitational waves (GWs) induced from curvature perturbations. For the GWs produced in a radiation-dominated era, we find that the observable…