15 citations · 34 across the 13 of their papers we have counts for
14 papers
Radiative Breaking of Two-Zero Neutrino Mass Minors: Revisiting the Model
Masahiro Ibe, Jun Miyamoto, Satoshi Shirai
The two-zero minor structure predicted by flavor symmetries is usually discussed as a tree-level relation among low-energy neutrino parameters. We point out that this relation can…
Fermion Multiplicities at the GUT Scale: A Statistical Study of Unification and Proton Decay
Akifumi Chitose, Ko Hirooka, Masahiro Ibe +1
We study the impact of multiple vector-like fermions in SU(5) grand unified theory (GUT). Threshold effects from extra fermions allow the observed gauge couplings to be consistentl…
A Closer Look at Constrained Instantons
Takafumi Aoki, Masahiro Ibe, Satoshi Shirai
Instantons play a crucial role in understanding non-perturbative dynamics in quantum field theories, including those with spontaneously broken gauge symmetries. In the broken phase…
Flavor Symmetry and Proton Decay in PeV-Scale Supersymmetry
Akifumi Chitose, Masahiro Ibe, Satoshi Shirai
Supersymmetry beyond the TeV scale offers several theoretical and phenomenological advantages, such as accommodating the observed Higgs mass and alleviating the flavor and CP probl…
Do Cosmic String Segments Emit Gravitational Waves?
Akifumi Chitose, Masahiro Ibe, Shunsuke Neda +1
Cosmic strings are predicted in various extensions of the Standard Model, including grand unified theories. Depending on the symmetry-breaking pattern, they can be either topologic…
Cosmic Strings in Multi-Step Symmetry Breaking
Akifumi Chitose, Masahiro Ibe, Satoshi Shirai +1
We investigate cosmic strings arising from a hierarchical gauge symmetry breaking sequence, $\mathrm{SU}(2) \times \mathrm{U}(1) \rightarrow \mathrm{U}(1) \times \mathrm{U}(1) \rig…
Stringent Constraints on Self-Interacting Dark Matter Using Milky-Way Satellite Galaxies Kinematics
Shin'ichiro Ando, Kohei Hayashi, Shunichi Horigome +2
Self-interacting dark matter (SIDM) has been proposed to address small-scale challenges faced by the cold dark matter (CDM) paradigm, such as the diverse density profiles observed…
Global Neutrino Constraints on the Minimal U(1) Model
Masahiro Ibe, Satoshi Shirai, Keiichi Watanabe
We examine the minimal U(1) gauge model in light of the latest neutrino data, including neutrino oscillations, cosmological observations, direct mass measurements, and…
Comprehensive Bayesian Exploration of Froggatt-Nielsen Mechanism
Masahiro Ibe, Satoshi Shirai, Keiichi Watanabe
The Froggatt-Nielsen (FN) mechanism successfully explains the hierarchical structure of fermion Yukawa couplings by introducing a U(1) flavor symmetry with distinct charge assignme…
Nucleon Decay as a Probe of Flavor Symmetry: The Case of Fake Unification
Masahiro Ibe, Satoshi Shirai, Keiichi Watanabe
This paper explores nucleon decay within the framework of a "fake Grand Unified Theory (GUT)" combined with the Froggatt-Nielsen (FN) mechanism. In this fake GUT framework, quarks…
Gravitational Waves from Metastable Cosmic Strings in Supersymmetric New Inflation Model
Akifumi Chitose, Masahiro Ibe, Shunsuke Neda +1
Recent observations by pulsar timing arrays (PTAs) indicate a potential detection of a stochastic gravitational wave (GW) background. Metastable cosmic strings have been recognized…
Small Instanton Effects on Composite Axion Mass
Takafumi Aoki, Masahiro Ibe, Satoshi Shirai +1
This paper investigates the impact of small instanton effects on the axion mass in composite axion models. In particular, we focus on the Composite Accidental Axion (CAA) models, w…
Constraining neutrino-DM interactions with Milky Way dwarf spheroidals and supernova neutrinos
Sean Heston, Shunsaku Horiuchi, Satoshi Shirai
We constrain the neutrino-dark matter cross section using properties of the dark matter density profiles of Milky Way dwarf spheroidal galaxies. The constraint arises from core-col…
Revisiting Metastable Cosmic String Breaking
Akifumi Chitose, Masahiro Ibe, Yuhei Nakayama +2
Metastable cosmic strings appear in models of new physics with a two-step symmetry breaking , where and . They decay via the monopole-antimono…