Inverted Hybrid Inflation as a solution to gravitino problems in Gravity Mediation (2007)
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 many inflation models...
R-invariant New Inflation Model vs Supersymmetric Standard Model (2007)
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 of the inflaton or...
Supersymmetric Tuned Inflation (2007)
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 separate...
Solutions to large B and L breaking in the Randall-Sundrum model (2007)
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 are explained only by...
A New Inflation Model with Anomaly-mediated Supersymmetry Breaking (2006)
Ibe, M., Shinbara, Y., Yanagida, T. T.
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 likely the last...
The Polonyi Problem and Upper bound on Inflation Scale in Supergravity (2006)
Ibe, M., Shinbara, Y., Yanagida, T. T.
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 scenarios, since the...
Minimal Supergravity, Inflation, and All That (2006)
Ibe, M., Shinbara, Y., Yanagida, T. T.
We consider an inflationary model in the hidden-sector broken supergravity with an effectively large cutoff. The inflaton decay into right-handed neutrinos naturally causes the observed baryon...
More on Conformally Sequestered SUSY Breaking (2005)
Ibe, M., Nakayama, Yu, Shinbara, Y., Yanagida, T.
We extend our models for conformal sequestering of dynamical supersymmetry breaking with decoupling vector-like matter in several different ways. These extensions enable us to simplify concrete model...
Conformally Sequestered SUSY Breaking in Vector-like Gauge Theories (2005)
Ibe, M., Nakayama, Yu, Shinbara, Y., Yanagida, T.
We provide, in a framework of vector-like gauge theories, concrete models for conformal sequestering of dynamical supersymmetry (SUSY) breaking in the hidden sector. If the sequestering is...