70 citations · 472 across the 27 of their papers we have counts for
8 papers · 1 filter
The Upper Bound of the Second Higgs Boson Mass in Minimal Gauge Mediation with the Gravitino Warm Dark Matter
Gongjun Choi, Tsutomu T. Yanagida, Norimi Yokozaki
A keV-scale gravitino arsing from a minimal supersymmetric (SUSY) Standard Model (MSSM) is an interesting possibility since the small scale problems that CDM model encounters in…
A Model of Interacting Dark Matter and Dark Radiation for and Tensions
Gongjun Choi, Tsutomu T. Yanagida, Norimi Yokozaki
We present a model describing the dark sector (DS) featured by two interactions remaining efficient until late times in the matter-dominated era after recombination: the interactio…
Dark Photon Dark Matter in the minimal Model
Gongjun Choi, Tsutomu T. Yanagida, Norimi Yokozaki
The extension of the Standard model (SM) with three heavy right handed neutrinos, a complex scalar and the gauged symmetry (the minimal model) is considered…
Feebly Interacting Gauge Boson Warm Dark Matter and XENON1T Anomaly
Gongjun Choi, Tsutomu T. Yanagida, Norimi Yokozaki
The recent observation of an excess in the electronic recoil data by the XENON1T detector has drawn many attentions as a potential hint for an extension of the Standard Model (SM).…
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…
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…
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…
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…