54 citations · 176 across the 9 of their papers we have counts for
9 papers
Inverted Hybrid Inflation as a solution to gravitino problems in Gravity Mediation
H. Nakajima, Y. Shinbara
It was recently found that the decay of inflaton and the SUSY breaking field produces many gravitinos in the gravity mediation scenario. These discoveries led to an exclusion of ma…
R-invariant New Inflation Model vs Supersymmetric Standard Model
M. Ibe, Y. Shinbara
We revisit the implications of the R-invariant New Inflation model to the supersymmetric standard model in light of recent discussion of gravitino production processes by the decay…
Supersymmetric Tuned Inflation
K. -I. Izawa, Y. Shinbara
We address an issue what kind of tuning realizes a flat potential for inflaton in supergravity. We restrict ourselves to the case that inflationary dynamics is not affected by sepa…
Solutions to large B and L breaking in the Randall-Sundrum model
H. Nakajima, Y. Shinbara
The stability of proton and neutrino masses are discussed in the Randall-Sundrum model. We show that relevant operators should be suppressed, if the hierarchical Yukawa matrices ar…
A New Inflation Model with Anomaly-mediated Supersymmetry Breaking
M. Ibe, Y. Shinbara, T. T. Yanagida
If there are a large number of vacua, multi-inflation may be a more mediocre phenomenon rather than a single inflation. In the multi-inflation scenario, new inflation is most likel…
The Polonyi Problem and Upper bound on Inflation Scale in Supergravity
M. Ibe, Y. Shinbara, T. T. Yanagida
We reconsider the Polonyi problem in gravity-mediation models for supersymmetry (SUSY) breaking. It has been argued that there is no problem in the dynamical SUSY breaking scenario…