146 citations · 832 across the 34 of their papers we have counts for
34 papers
Role of QCD in moduli stabilization during inflation and axion dark matter
Ryuichiro Kitano, Motoo Suzuki, Wen Yin
Ignorance of the initial condition for the axion dynamics in the early Universe has led us to consider an valued initial amplitude, and that prefers the decay constant, $F_a…
NANOGrav Signal from a Dark Conformal Phase Transition
Kohei Fujikura, Sudhakantha Girmohanta, Yuichiro Nakai +1
We explore the possibility that a confining first-order phase transition of a nearly-conformal dark sector generates the reported NANOGrav signal of a stochastic gravitational wave…
Multi-brane cosmology
Sudhakantha Girmohanta, Seung J. Lee, Yuichiro Nakai +1
5D warped extra dimension models with multiple 3-branes can naturally realize multiple hierarchical mass scales which are ubiquitous in physics beyond the Standard Model. We discus…
More on Fake GUT
Masahiro Ibe, Satoshi Shirai, Motoo Suzuki +2
It is remarkable that the matter fields in the Standard Model (SM) are apparently unified into the representations. A straightforward explanation of this fact is t…
A Natural Model of Spontaneous CP Violation
Sudhakantha Girmohanta, Seung J. Lee, Yuichiro Nakai +1
We examine the possibility of building a natural non-supersymmetric model of spontaneous CP violation equipped with the Nelson-Barr (NB) mechanism to address the strong CP problem.…
High Quality Axion via a Doubly Composite Dynamics
Seung J. Lee, Yuichiro Nakai, Motoo Suzuki
We explore a new framework that furnishes a mechanism to simultaneously address the electroweak naturalness problem and the axion high quality problem. The framework is based on a…
Gauge Kinetic Mixing and Dark Topological Defects
Takashi Hiramatsu, Masahiro Ibe, Motoo Suzuki +1
We discuss how the topological defects in the dark sector affect the Standard Model sector when the dark photon has a kinetic mixing with the QED photon. In particular, we consider…
Multiple Hierarchies from a Warped Extra Dimension
Seung J. Lee, Yuichiro Nakai, Motoo Suzuki
Theories beyond the Standard Model often contain mass scales hierarchically different from the electroweak scale and the Planck scale. It has been shown that such hierarchical mass…
Supersymmetric Alignment Models for
Yuichiro Nakai, Matthew Reece, Motoo Suzuki
Hierarchical masses of quarks and leptons are addressed by imposing horizontal symmetries. In supersymmetric Standard Models, the same symmetries play a role in suppressing flavor…
Spontaneous CP Violation and Horizontal Symmetry in the MSSM: Toward Lepton Flavor Naturalness
Daniel Aloni, Pouya Asadi, Yuichiro Nakai +2
We study the contributions of supersymmetric models with a horizontal symmetry and only spontaneous CP breaking to various lepton flavor observables, such as and t…
Axion Quality from Superconformal Dynamics
Yuichiro Nakai, Motoo Suzuki
We discuss a possibility that a superconformal dynamics induces the emergence of a global symmetry to solve the strong CP problem through the axion. Fields spontane…
Gravitational Waves and Dark Radiation from Dark Phase Transition: Connecting NANOGrav Pulsar Timing Data and Hubble Tension
Yuichiro Nakai, Motoo Suzuki, Fuminobu Takahashi +1
Recent pulsar timing data reported by the NANOGrav collaboration may indicate the existence of a stochastic gravitational wave background around Hz. We explore a p…
Implications of Gravitational-wave Production from Dark Photon Resonance to Pulsar-timing Observations and Effective Number of Relativistic Species
Ryo Namba, Motoo Suzuki
The coherent oscillation of axionic fields naturally drives copious production of dark photon particles in the early universe, due to resonance and tachyonic enhancement. During th…
XENON1T Anomaly and its Implication for Decaying Warm Dark Matter
Gongjun Choi, Motoo Suzuki, Tsutomu T. Yanagida
An excess in the electronic recoil data was observed in the XENON1T detector. One of plausible explanations for the excess is absorption of a vector bosonic particle with the mass…
Inelastic Dark Matter Electron Scattering and the XENON1T Excess
Keisuke Harigaya, Yuichiro Nakai, Motoo Suzuki
Detection of electron recoils by dark matter (DM) may reveal the structure of the dark sector. We consider a scenario where a heavier DM particle inelastically scatters off an elec…
QCD Axion From a Spontaneously Broken B-L Gauge Symmetry
Gongjun Choi, Motoo Suzuki, Tsutomu T. Yanagida
In this paper, we show that the Peccei-Quinn (PQ) symmetry with a good quality can be realized in a simple extension of the minimal supersymmetric standard model. The PQ symm…
Cosmic String in Abelian-Higgs Model with Enhanced Symmetry -- Implication to the Axion Domain-Wall Problem --
Takashi Hiramatsu, Masahiro Ibe, Motoo Suzuki
In our previous work, we found new types of the cosmic string solutions in the Abelian-Higgs model with an enhanced global symmetry. We dubbed those solutions as the compens…
Degenerate Fermion Dark Matter from a Broken Gauge Symmetry
Gongjun Choi, Motoo Suzuki, Tsutomu. T. Yanagida
The extension of the Standard model by assuming gauge symmetry is very well-motivated since it naturally explains the presence of heavy right-handed neutrinos requ…
Spherically Symmetric Scalar Hair for Charged Black Holes
Jeong-Pyong Hong, Motoo Suzuki, Masaki Yamada
The no-hair theorem by Mayo and Bekenstein states that there exists no non-extremal static and spherical charged black hole endowed with hair in the form of a charged scalar field…
Degenerate Sub-keV Fermion Dark Matter from a Solution to the Hubble Tension
Gongjun Choi, Motoo Suzuki, Tsutomu T. Yanagida
We present a dark sector model addressing both the Hubble tension and the core-cusp problem. The model is based on a hidden Abelian gauge symmetry group with some chiral fermions r…
New Type of String Solutions with Long Range Forces
Takashi Hiramatsu, Masahiro Ibe, Motoo Suzuki
We explore the formation and the evolution of the string network in the Abelian Higgs model with two complex scalar fields. A special feature of the model is that it possesses a gl…
Quintessence Axion Dark Energy and a Solution to the Hubble Tension
Gongjun Choi, Motoo Suzuki, Tsutomu T. Yanagida
We present a model in which the question about a nature of the dark energy and the recently raised Hubble tension can be addressed at once. We consider the electroweak axion in the…
A Dynamical Solution to the Axion Domain Wall Problem
Masahiro Ibe, Shin Kobayashi, Motoo Suzuki +1
The domain wall problem and the isocurvature problem restrict possible combinations of axion models and inflation models. In this paper, we considered a new mechanism which solves…
Charged black holes in non-linear Q-clouds with O(3) symmetry
Jeong-Pyong Hong, Motoo Suzuki, Masaki Yamada
We construct charged soliton solutions around spherical charged black holes with no angular momentum in asymptotically flat spacetime. These solutions are non-linear generalization…