202 citations · 834 across the 12 of their papers we have counts for
12 papers
Primordial Origin of Supermassive Black Holes from Axion Bubbles
Kentaro Kasai, Masahiro Kawasaki, Naoya Kitajima +3
We study a modification of the primordial black hole (PBH) formation model from axion bubbles. We assume that the Peccei-Quinn scalar rolls down in the radial direction from a larg…
MSSM curvaton in the gauge-mediated SUSY breaking
S. Kasuya, M. Kawasaki, Fuminobu Takahashi
We study the curvaton scenario using the MSSM flat directions in the gauge-mediated SUSY breaking model. We find that the fluctuations in the both radial and phase directions can b…
Affleck-Dine mechanism with negative thermal logarithmic potential
S. Kasuya, M. Kawasaki, Fuminobu Takahashi
We investigate whether the Affleck-Dine (AD) mechanism works when the contribution of the two-loop thermal correction to the potential is negative in the gauge-mediated supersymmet…
I-balls
S. Kasuya, M. Kawasaki, Fuminobu Takahashi
We find that there exists a soliton-like solution ``I-ball'' in theories of a real scalar field if the scalar potential satisfies appropriate conditions. Although the I-ball does n…
Large lepton asymmetry from Q-balls
M. Kawasaki, Fuminobu Takahashi, Masahide Yamaguchi
We propose a scenario which can explain large lepton asymmetry and small baryon asymmetry simultaneously. Large lepton asymmetry is generated through Affleck-Dine (AD) mechanism an…
On the Moduli Problem and Baryogenesis in Gauge-mediated SUSY Breaking Models
S. Kasuya, M. Kawasaki, Fuminobu Takahashi
We investigate whether the Affleck-Dine mechanism can produce sufficient baryon number of the universe in the gauge-mediated SUSY breaking models, while evading the cosmological mo…
Q-ball formation: Obstacle to Affleck-Dine baryogenesis in the gauge-mediated SUSY breaking ?
S. Kasuya, M. Kawasaki
We consider the Affleck-Dine baryogenesis comprehensively in the minimal supersymmetric standard model with gauge-mediated supersymmetry breaking. Considering the high temperature…
New type of stable Q balls in the gauge-mediated supersymmetry breaking
S. Kasuya, M. Kawasaki
We obtain a new type of a stable Q ball in the context of gauge-mediated supersymmetry breaking in minimal supersymmetric standard model. It is so-called gravity-mediation type of…
Q-ball formation in the gravity-mediated SUSY breaking scenario
S. Kasuya, M. Kawasaki
We study the formation of Q-balls which are made of flat directions that appear in the supersymmetric extension of the standard model in the context of gravity-mediated supersymmet…
Evolution of a global string network in a matter dominated universe
Masahide Yamaguchi, Jun'ichi Yokoyama, M. Kawasaki
We evolve the network of global strings in the matter-dominated universe by means of numerical simulations. The existence of the scaling solution is confirmed as in the radiation-d…
Cosmological Moduli Problem and Oscillating Inflation in Gauge-Mediated Supersymmetry Breaking
T. Asaka, M. Kawasaki, Masahide Yamaguchi
We investigate cosmological moduli problem in the gauge-mediated supersymmetry breaking (GMSB). A mini-inflation (oscillating inflation) takes place when a scalar field correspondi…
Numerical analysis of formation and evolution of global strings in 2+1 dimensions
Masahide Yamaguchi, Jun'ichi Yokoyama, M. Kawasaki
We simulate the formation and the evolution of global strings taking into account the expansion of the universe and the concomitant change of the effective potential, that is, the…