91 citations · 865 across the 52 of their papers we have counts for
8 papers · 1 filter
Hierarchy problem, gauge coupling unification at the Planck scale, and vacuum stability
Naoyuki Haba, Hiroyuki Ishida, Ryo Takahashi +1
From the point of view of the gauge hierarchy problem, introducing an intermediate scale in addition to TeV scale and the Planck scale (…
dark matter-philic Higgs for 3.5 keV X-ray signal
Naoyuki Haba, Hiroyuki Ishida, Ryo Takahashi
We suggest a new model of 7 keV right-handed neutrino dark matter inspired by a recent observation of 3.5 keV X-ray line signal in the XMM-Newton observatory. It is difficult to de…
3.55 keV X-ray Line Interpretation in Radiative Neutrino Model
Hiroyuki Ishida, Hiroshi Okada
We discuss the 3.55 keV X-ray line anomaly reported by XMN-Newton X-ray observatory using data of various galaxy clusters and Andromeda galaxy in a radiative neutrino model, in whi…
Vanishing Higgs potential at the Planck scale in a singlet extension of the standard model
Naoyuki Haba, Hiroyuki Ishida, Kunio Kaneta +1
We discuss the realization of a vanishing effective Higgs potential at the Planck scale, which is required by the multiple-point criticality principle (MPCP), in the standard model…
Higgs inflation and Higgs portal dark matter with right-handed neutrinos
Naoyuki Haba, Hiroyuki Ishida, Ryo Takahashi
We investigate the Higgs inflation and the Higgs portal dark matter with the right-handed neutrino. The dark matter and the right-handed neutrino in the Higgs inflation play import…
U(1) Symmetry Restoration and Effective Neutrino Species
Hiroyuki Ishida, Fuminobu Takahashi
The U(1) symmetry could be restored during inflation, since the BICEP2 results suggest a GUT-scale inflation with the Hubble parameter, GeV, cl…