27 citations · 78 across the 25 of their papers we have counts for
26 papers
Textures of dimension-six operators in the SMEFT with non-invertible selection rules
Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1
We investigate the flavor structures of dimension-six operators in the Standard Model Effective Field Theory (SMEFT) subject to non-invertible selection rules. In particular, we cl…
Massive modes on magnetized blow-up manifold of
Tatsuo Kobayashi, Hajime Otsuka, Hikaru Uchida
We study massive modes on a magnetized blow-up manifold of . The blow-up manifold can be constructed by appropriately replacing orbifold singular points with a pa…
Residual group-like symmetries in selection rules without group actions
Jun Dong, Tatsuo Kobayashi, Shuhei Miyamoto +2
We analyze loop-induced group-like symmetries in theories where fields are labeled by basis elements of a fusion algebra constructed from the conjugacy classes of finite groups. Al…
Yukawa Textures with Enhanced Symmetries in Heterotic Calabi-Yau Compactifications
Jun Dong, Tatsuo Kobayashi, Shuhei Miyamoto +1
We clarify the structure of Yukawa couplings and mass matrices for matter fields in heterotic string theory on smooth Calabi-Yau threefolds with standard embedding. The topological…
Modular weights of wave functions on magnetized torus
Tim Jeric, Tatsuo Kobayashi, Hajime Otsuka +2
We study the origin of modular weights of wave functions in magnetized models. It is explicitly demonstrated that the modular weights of the wave functions on magnetized $T…
Generalized CP from non-invertible selection rules
Tatsuo Kobayashi, Hajime Otsuka
We study a framework in which fields are labeled by basis elements of a fusion algebra with non-invertible fusion rules. In particular, we consider the case where fields are labele…
GUT-motivated non-invertible symmetry as a solution to the strong CP problem and the neutrino CP-violating phase
Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1
The unsuppressed CP violation in QCD is a problem in the standard model. If we have some mechanism to guarantee real determinants of the quark mass matrices, the vanishing physical…
Non-Invertible Selection Rules on Heterotic Non-Abelian Orbifolds
Tatsuo Kobayashi, Ryusei Nishida, Hajime Otsuka
We investigate coupling selection rules in heterotic string theory on non-Abelian orbifolds. Since boundary conditions on the orbifolds are classified by conjugacy classes of space…
Stringy Constraints on Modular Flavor Models
Keiya Ishiguro, Takafumi Kai, Tatsuo Kobayashi +1
We investigate stringy constraints on moduli spaces in modular flavor models by analyzing moduli-dependent threshold corrections in heterotic string vacua. While moduli play a cruc…
Non-invertible Symmetry as a Solution to the Strong CP Problem in a GUT-inspired Standard Model
Tatsuo Kobayashi, Hajime Otsuka, Tsutomu T. Yanagida
We propose a three-zero texture for the down-quark mass matrix within a GUT-inspired Standard Model, enforced by a non-invertible selection rule originating from $\mathbb{Z…
Matter symmetries in supersymmetric standard models from non-invertible selection rules
Tatsuo Kobayashi, Hironobu Mita, Hajime Otsuka +1
We discuss phenomenological implications of non-invertible selection rules in the framework of the supersymmetric standard model. We find that a remnant symmetry of…
Radiative neutrino mass models from non-invertible selection rules
Tatsuo Kobayashi, Hiroshi Okada, Hajime Otsuka
We apply non-invertible selection rules coming from a fusion algebra to radiative neutrino mass models where fields are labeled by the elements in the algebra. Since non-invertible…
Lepton mass textures from non-invertible multiplication rules
Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1
We study the lepton mass textures, which are derived by gauging of symmetries. We can obtain various textures for the Yukawa couplings in the charged…
Coupling Selection Rules in Heterotic Calabi-Yau Compactifications
Jun Dong, Tatsuo Kobayashi, Ryusei Nishida +2
We study coupling selection rules of chiral matter fields in heterotic string theory with standard embedding. These selection rules are determined by topological properties of Cala…
More about quark Yukawa textures from selection rules without group actions
Tatsuo Kobayashi, Yume Nishioka, Hajime Otsuka +1
We study the coupling selection rules associated with non-group symmetries, i.e., gauging of symmetries. We clarify which Yukawa textures can be deriv…
Classification of Modular Symmetries in Type IIB Flux Landscape
Keiya Ishiguro, Takafumi Kai, Tatsuo Kobayashi +2
In this work, we study modular symmetries in type IIB flux landscape by investigating symplectic basis transformations of period vectors on toroidal orbifolds. To fix explicit cycl…
Zee-Babu model in a non-holomorphic modular symmetry and modular stabilization
Tatsuo Kobayashi, Hiroshi Okada, Yuta Orikasa
We study a Zee-Babu neutrino model in a non-holomorphic modular symmetry, and we construct a model so that there are minimum free parameters (two complex parameters). We find…
Quantum aspects of non-invertible flavor symmetries in intersecting/magnetized D-brane models
Shuta Funakoshi, Tatsuo Kobayashi, Hajime Otsuka
We discuss selection rules of chiral matters in type IIA intersecting and IIB magnetized D-brane models on toroidal orbifolds. Since the chiral matters on toroidal orbifolds are la…
Modular symmetry of localized modes
Tatsuo Kobayashi, Hajime Otsuka, Shohei Takada +1
We study the modular symmetry of localized modes on fixed points of orbifold. First, we find that the localized modes with even (odd) modular weight generally ha…
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…
Yukawa textures from non-invertible symmetries
Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto
Phenomenological aspects of non-invertible symmetries, in particular the flavor structure of quarks and leptons, are studied. We start with a discrete symmetry and g…
Non-invertible flavor symmetries in magnetized extra dimensions
Tatsuo Kobayashi, Hajime Otsuka
We discuss non-invertible symmetries in toroidal compactifications of higher dimensional Yang-Mills theory with magnetic fluxes, which can be regarded as an effective action of typ…
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…
Modular forms and hierarchical Yukawa couplings in heterotic Calabi-Yau compactifications
Keiya Ishiguro, Tatsuo Kobayashi, Satsuki Nishimura +1
We study the modular symmetry in heterotic string theory on Calabi-Yau threefolds. In particular, we examine whether moduli-dependent holomorphic Yukawa couplings are described by…