226 citations · 1.4k across the 19 of their papers we have counts for
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violation in modular invariant flavor models
Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi +3
We study the spontaneous violation through the stabilization of the modulus in modular invariant flavor models. The -invaraiant potentential has the minimum only at ${…
Modular invariance and leptogenesis
Takehiko Asaka, Yongtae Heo, Takuya H. Tatsuishi +1
We consider a model with three right-handed neutrinos in which Yukawa coupling constants and Majorana masses are obtained by requiring the modular symmetry. It has been shown…
lepton flavor model and modulus stabilization from modular symmetry
Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi +2
We study the modulus stabilization in an model whose flavor symmetry is originated from the modular symmetry. We can stabilize the modulus so that the invar…
New lepton flavor model from modular symmetry
Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi +2
We study a flavor model with symmetry which originates from modular group. In symmetry, subgroup can be anomalous, and then can be violated to .…
Modular invariant flavor model in SU(5) GUT
Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi +2
We present a flavor model with the modular invariance in the framework of SU(5) GUT. The modular forms of weights and give the quark and lepton mass matrices wi…
On Experimental Confirmation of the Corrections to the Fermi's golden rule
Kenzo Ishikawa, Osamu Jinnouchi, Arisa Kubota +3
Standards calculations by the Fermi's Golden rule involve approximations. These approximations could lead to deviations from the predictions of the standard model as discussed in a…
Finite modular subgroups for fermion mass matrices and baryon/lepton number violation
Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi +3
We study a flavor model that the quark sector has the modular symmetry,while the lepton sector has the modular symmetry. Our model leads to characteristic quark mass ma…
Modular invariance and neutrino mixing
Tatsuo Kobayashi, Naoya Omoto, Yusuke Shimizu +3
We study the phenomenological implications of the modular symmetry of lepton flavors facing recent experimental data of neutrino oscillations. The mass matrices o…
Neutrino mixing from finite modular groups
Tatsuo Kobayashi, Kentaro Tanaka, Takuya H. Tatsuishi
We study the lepton flavor models, whose flavor symmetries are finite subgroups of the modular group such as and . In our models, couplings are also nontrivial represent…
Small field axion inflation with sub-Planckian decay constant
Kenji Kadota, Tatsuo Kobayashi, Akane Oikawa +3
We study an axion inflation model recently proposed within the framework of type IIB superstring theory, where we pay a particular attention to a sub-Planckian axion decay constant…
Flavor structure in heterotic string theory
Hiroyuki Abe, Tatsuo Kobayashi, Hajime Otsuka +2
We study the flavor structure in heterotic string theory on six-dimensional torus with magnetic fluxes. In particular, we focus on models with the flavor symmetries $SU(3)…
Gauge coupling unification in SO(32) heterotic string theory with magnetic fluxes
Hiroyuki Abe, Tatsuo Kobayashi, Hajime Otsuka +2
We study heterotic string theory on torus with magnetic fluxes. Non-vanishing fluxes can lead to non-universal gauge kinetic functions for $SU(3) \times SU(2) \times U(1)_…