405 citations · 2.7k across the 85 of their papers we have counts for
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Primordial black hole formation from massless scalar isocurvature
Chul-Moon Yoo, Tomohiro Harada, Shin'ichi Hirano +2
We numerically study the primordial black hole (PBH) formation by an isocurvature perturbation of a massless scalar field on super Hubble scales in the radiation-dominated universe…
Primordial black holes in peak theory with a non-Gaussian tail
Naoya Kitajima, Yuichiro Tada, Shuichiro Yokoyama +1
In this paper, we update the peak theory for the estimation of the primordial black hole (PBH) abundance, particularly by implementing the critical behavior in the estimation of th…
False Vacuum Decay in Rotating BTZ Spacetimes
Daiki Saito, Chul-Moon Yoo
We analyse vacuum decay in rotating BTZ black hole spacetimes with the thin wall approximation. Possible parameter regions for the vacuum decay are clarified. We find that the nucl…
Testing the Non-circularity of the Spacetime around Sagittarius A* with Orbiting Pulsars
Yohsuke Takamori, Atsushi Naruko, Yusuke Sakurai +3
A disformal Kerr black hole solution is a rotating black hole solution in a modified gravity theory which breaks the circular condition of spacetime differently from the case of th…
Thermal equilibrium states and instability of self-gravitating particles in an asymptotically AdS spacetime
Hiroki Asami, Chul-Moon Yoo
We investigate the existence and the stability of spherically symmetric thermal equilibrium states of the self-gravitating many-particle system which satisfies the Einstein-Vlasov…
Axion Cloud Decay due to the Axion-photon Conversion with Background Magnetic Fields
Chul-Moon Yoo, Atsushi Naruko, Yusuke Sakurai +3
We consider an axion cloud around a black hole with background magnetic fields. We calculate the decay rate of the axion cloud due to the axion-photon conversion associated with th…