28 citations · 121 across the 20 of their papers we have counts for
20 papers
Generation structures and Yukawa couplings in magnetized models
Tim Jeric, Tatsuo Kobayashi, Kaito Nasu +1
We study fermion zero-mode wave functions with various chiralities in magnetized , torus. First, we consider the wave functions satisfying the Dirac equation and…
Large and small hierarchies from finite modular symmetries
Tetsutaro Higaki, Junichiro Kawamura, Tatsuo Kobayashi +2
We study the moduli stabilization by the radiative corrections due to the moduli dependent vector-like masses invariant under the finite modular symmetry. The radiative stabilizati…
Moduli stabilization and light axion by Siegel modular forms
Shuta Funakoshi, Junichiro Kawamura, Tatsuo Kobayashi +2
We discuss the stabilization of multiple moduli by utilizing Siegel modular forms in the framework of modular invariant theories. We derive the stationary condi…
Flavor symmetries from modular subgroups in magnetized compactifications
Tatsuo Kobayashi, Kaito Nasu, Ryusei Nishida +2
We study the flavor structures of zero-modes, which are originated from the modular symmetry on and its orbifold with magnetic fluxes. We introduce the constrai…
Spontaneous CP violation and partially broken modular flavor symmetries
Tetsutaro Higaki, Tatsuo Kobayashi, Kaito Nasu +1
We study the realization of spontaneous CP violation through moduli stabilization. In modular flavor models, the source of CP violation is the vacuum expectation values of the comp…
Moduli stabilization in finite modular symmetric models
Yoshihiko Abe, Komei Goto, Testutaro Higaki +2
We study vacua of moduli potential consisting of multiple contribution of modular forms in a finite modular symmetry. If the potential is given by a single modular form, the Minkow…
CP phase in modular flavor models and discrete Froggatt-Nielsen models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu
We study the large mass hierarchy and CP violation in the modular symmetric quark flavor models without fine-tuning. Mass matrices are written in terms of modular forms. Modular fo…
modular symmetry in flavor structures: quark flavor models and Siegel modular forms for
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study an approach to construct Siegel modular forms from . Zero-mode wave functions on with magnetic flux background behave Siegel modular forms at the origin. Th…
Radiative correction on moduli stabilization in modular flavor symmetric models
Tatsuo Kobayashi, Kaito Nasu, Riku Sakuma +1
We study the radiative corrections to the stabilization of the complex structure modulus in modular flavor symmetric models. We discuss the possibility of obtaining the vacuum…
Modular symmetry in magnetized torus and orbifold models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study the modular symmetry in magnetized torus and orbifold models. The torus has the modular symmetry . Magnetic flux background brea…
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…
Zero-modes in magnetized orbifold models through modular symmetry
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study of fermion zero-modes on magnetized orbifolds. In particular, we focus on non-factorizable orbifolds, i.e. and …
Quark mass hierarchies and CP violation in modular symmetric flavor models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study modular symmetric flavor models to realize quark mass hierarchies and mixing angles without fine-tuning. Mass matrices are written in terms of…
Quark hierarchical structures in modular symmetric flavor models at level 6
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study modular symmetric quark flavor models without fine-tuning. Mass matrices are written in terms of modular forms, and modular forms in the vicinity of the modular fixed poin…
Remark on modular weights in low-energy effective field theory from type II string theory
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +3
We revisit the modular weights in type IIB magnetized D-brane models. The simple analysis of wave function shows that the four-dimensional matter fields have the modular weight -1/…
Number of zero-modes on magnetized orbifolds analyzed by modular transformation
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study fermion zero-mode wavefunctions on orbifold with background magnetic fluxes. The number of zero-modes is analyzed by use of modular transforma…
Modular symmetry of soft supersymmetry breaking terms
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +3
We study the modular symmetry of soft supersymmetry breaking terms. Soft scalar masses and -term coefficients are invariant under the modular symmetry when we regard -term as…
Classifications of magnetized and orbifold models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +1
We study constructions and classifications of three-generation models based on magnetized and orbifold as candidates of the compact space. We focus on chiral ferm…
Modular symmetry anomaly and non-perturbative neutrino mass terms in magnetized orbifold models
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu +2
We study the modular symmetry anomaly in magnetized orbifold models. The non-perturbative effects such as D-brane instanton effects can break tree-level symmetry. We study which pa…
Majorana neutrino masses by D-brane instanton effects in magnetized orbifold models
Kouki Hoshiya, Shota Kikuchi, Tatsuo Kobayashi +3
We study Majorana neutrino masses induced by D-brane instanton effects in magnetized orbifold models. We classify possible cases, where neutrino masses can be induced. Three and fo…