78 citations · 838 across the 56 of their papers we have counts for
11 papers · 1 filter
Moduli trapping mechanism in modular flavor symmetric models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +1
We discuss how the moduli in modular flavor symmetric models dynamically select enhanced symmetry points at which the residual modular symmetry renders extra matter fields massless…
Chiral gravitational effect in time-dependent backgrounds
Kohei Kamada, Jun'ya Kume, Yusuke Yamada
Gravitational counterpart of the chiral magnetic effect, which is referred as the chiral gravitational effect, can also be of interest in a cosmological setup. In this study, we in…
Renormalization in gravitational leptogenesis with pseudo-scalar-tensor coupling
Kohei Kamada, Jun'ya Kume, Yusuke Yamada
We consider the renormalization in the pseudo-scalar inflation models with the gravitational Chern-Simons term. In this model, lepton asymmetry is generated from the chiral gravita…
Gravitational leptogenesis with kination and gravitational reheating
Kohei Kamada, Jun'ya Kume, Yusuke Yamada +1
We revisit the gravitational leptogenesis scenario in which the inflaton is coupled to gravity by the Chern-Simons term and the lepton asymmetry is generated through the gravitatio…
Gravitino Problem in Inflation Driven by Inflaton-Polonyi Kähler Coupling
Fuminori Hasegawa, Kazunori Nakayama, Takahiro Terada +1
We discuss the cosmological gravitino problem in inflation models in which the inflaton potential is constructed from Kähler potential rather than superpotential: a representative…
Gravitino Problem in Minimal Supergravity Inflation
Fuminori Hasegawa, Kyohei Mukaida, Kazunori Nakayama +2
We study non-thermal gravitino production in the minimal supergravity inflation. In this minimal model utilizing orthogonal nilpotent superfields, the particle spectrum includes on…
Cosmological relaxation and high scale inflation
Tetsutaro Higaki, Naoyuki Takeda, Yusuke Yamada
We study whether the relaxion mechanism solves the Higgs hierarchy problem against a high scale inflation or a high reheating temperature. To accomplish the mechanism, we consider…
Reheating processes after Starobinsky inflation in old-minimal supergravity
Takahiro Terada, Yuki Watanabe, Yusuke Yamada +1
We study reheating processes and its cosmological consequences in the Starobinsky model embedded in the old-minimal supergravity. First, we consider minimal coupling between the gr…
Natural realization of large extra dimension in 5D supersymmetric theory
Yutaka Sakamura, Yusuke Yamada
An exponentially large extra dimension can be naturally realized by the Casimir energy and the gaugino condensation in 5D supersymmetric theory. The model does not require any hier…
Instant uplifted inflation: A solution for a tension between inflation and SUSY breaking scale
Yusuke Yamada
The Hubble parameter during the inflationary era must be smaller than the gravitino mass if the moduli are stabilized by the Kachru-Kallosh-Linde-Trivedi mechanism. This condition…
SUSY flavor structure of generic 5D supergravity models
Hiroyuki Abe, Hajime Otsuka, Yutaka Sakamura +1
We perform a comprehensive and systematic analysis of the SUSY flavor structure of generic 5D supergravity models on with multiple -odd vector multiplets that genera…