99 citations · 519 across the 25 of their papers we have counts for
25 papers
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…
Modular flavor symmetric models
Tatsuo Kobayashi, Morimitsu Tanimoto
We review the modular flavor symmetric models of quarks and leptons focusing on our works. We present some flavor models of quarks and leptons by using finite modular groups and di…
Fermion Hierarchies in Grand Unification from Modular Flavor Symmetry
Yoshihiko Abe, Tetsutaro Higaki, Junichiro Kawamura +1
We construct a model in which the hierarchies of the quark and lepton masses and mixing are explained by the modular flavor symmetry. The hierarchies are realized by t…
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 …
Moduli inflation from modular flavor symmetries
Yoshihiko Abe, Tetsutaro Higaki, Fumiya Kaneko +2
We study slow-roll inflation model controlled by the modular flavor symmetry. In the model, the modulus field plays a role of inflaton and the introduction of the stabilizer field…
Quark and lepton hierarchies from modular flavor symmetry
Yoshihiko Abe, Tetsutaro Higaki, Junichiro Kawamura +1
We propose models in which the hierarchical structures of the masses and mixing in both quark and lepton sectors are explained by the modular flavor symmetry near the…
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/…
Zero-mode wave functions by localized gauge fluxes
Tatsuo Kobayashi, Hajime Otsuka, Makoto Sakamoto +3
We study chiral zero-mode wave functions on blow-up manifolds of orbifolds with both bulk and localized magnetic flux backgrounds. We introduce a singular gauge transform…
Index theorem on magnetized blow-up manifold of
Tatsuo Kobayashi, Hajime Otsuka, Makoto Sakamoto +3
We investigate blow-up manifolds of orbifolds with magnetic flux . Since the blow-up manifolds have no singularities, we can apply the Atiyah-S…
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…
Quark and lepton flavor structure in magnetized orbifold models at residual modular symmetric points
Kouki Hoshiya, Shota Kikuchi, Tatsuo Kobayashi +1
We study quark and lepton mass matrices derived from magnetized orbifold models. Quark and lepton masses have a large hierarchy. In addition, mixing angles are l…
Texture zeros of quark mass matrices at fixed point in modular flavor symmetry
Shota Kikuchi, Tatsuo Kobayashi, Morimitsu Tanimoto +1
We study systematically derivation of the specific texture zeros, that is the nearest neighbor interaction (NNI) form of the quark mass matrices at the fixed point in modular…
Generalized Matter Parities from Finite Modular Symmetries
Tatsuo Kobayashi, Satsuki Nishimura, Hajime Otsuka +2
We classify a supersymmetric extension of the Standard Model by discrete symmetries originating from finite modular symmetries . Since all the couplings in supersymmetric theo…
Mass matrices with CP phase in modular flavor symmetry
Shota Kikuchi, Tatsuo Kobayashi, Morimitsu Tanimoto +1
We study the CP violation and the CP phase of quark mass matrices in modular flavor symmetric models. The CP symmetry remains at by a combination of the -symmetr…
Lepton flavor violation, lepton and electron EDM in the modular symmetry
Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1
We study the lepton flavor violation (LFV), the leptonic magnetic moments and the electric dipole moment (EDM) of the electron in the Standard-Model Effective Fiel…
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…
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…
Kaluza-Klein Mediated Supersymmetry Breaking
Tatsuo Kobayashi, Koichi Yoshioka
We discuss a framework for communicating supersymmetry breaking to the visible sector where the radius modulus, which determines the size of extra dimensions, has an auxiliary vacu…
Constraints on Finite Soft Supersymmetry Breaking Terms
T. Kobayashi, J. Kubo, M. Mondragon +1
A new solution to the requirement of two-loop finiteness of the soft supersymmetry breaking terms (SSB) parameters is found in Finite-Gauge-Yukawa unified theories. The new solutio…
Quark Mass Matrices in Superstring Models
T. Kobayashi, Z. Z. Xing
Four simple but realistic patterns of quark mass matrices are derived from orbifold models of superstring theory in the absence of gauge symmetries. Two of them correspond to the R…