68 citations · 196 across the 15 of their papers we have counts for
9 papers · 1 filter
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…