33 citations · 115 across the 12 of their papers we have counts for
12 papers
Renormalization Group Running of the Minimal Leptophilic Dark Matter Model toward a UV Completion
Osamu Seto, Tetsuo Shindou, Takanao Tsuyuki
We study the renormalization group running of the coupling constants in a minimal leptophilic dark matter model in which a Standard Model singlet fermion, acting as the dark matter…
Lorentzian homogeneous Ricci-flat metrics on almost abelian Lie groups
Yuichiro Sato, Takanao Tsuyuki
When the identity component of the full isometry group of a four-dimensional spacetime acts simply transitively, the unique Ricci-flat metric is the Petrov solution. This isometry…
Spatially homogeneous solutions of vacuum Einstein equations in general dimensions
Yuichiro Sato, Takanao Tsuyuki
We study time-dependent compactification of extra dimensions. We assume that the spacetime is spatially homogeneous, and solve the vacuum Einstein equations without cosmological co…
Three-generation solutions of equations of motion in heterotic supergravity
Maki Takeuchi, Takanao Tsuyuki, Hikaru Uchida
We study the generation number of massless fermions in compactifications recently found in heterotic supergravity. The internal spaces are products of two-dimensional spaces of con…
Low-scale leptogenesis and dark matter in a three-loop radiative seesaw model
Osamu Seto, Tetsuo Shindou, Takanao Tsuyuki
We show that three open questions in particle physics and cosmology: the origin of neutrino mass, the identity of dark matter, and the origin of the baryon asymmetry of the univers…
Lower bounds on lepton flavor violating branching ratios in a radiative seesaw model
Osamu Seto, Tetsuo Shindou, Takanao Tsuyuki
We study the lepton flavor violating decays such as , , in the three-loop radiative seesaw model proposed by Krauss, Nasri, and Trodden. In this model,…
Minkowski spacetime and non-Ricci-flat compactification in heterotic supergravity
Takanao Tsuyuki
We compactify the ten-dimensional spacetime in heterotic supergravity leaving four-dimensional Minkowski spacetime. We search for nonsupersymmetric, non-Ricci-flat solutions of the…
Perturbativity in the seesaw mechanism
Takehiko Asaka, Takanao Tsuyuki
We consider the Standard Model extended by right-handed neutrinos to explain massive neutrinos through the seesaw mechanism. The new fermion can be observed when it has a sufficien…
Seesaw mechanism at electron-electron colliders
Takehiko Asaka, Takanao Tsuyuki
We consider the Standard Model with right-handed neutrinos to explain the masses of active neutrinos by the seesaw mechanism. Since active neutrinos as well as heavy neutral lepton…
Scalar clouds in charged stringy black hole-mirror system
Ran Li, Junkun Zhao, Xinghua Wu +1
It is reported that massive scalar fields can form bound states around Kerr black holes [C. Herdeiro, and E. Radu, Phys. Rev. Lett. 112, 221101 (2014)]. These bound states are call…
Bottom-tau unification by neutrinos in a nonsupersymmetric SU(5) model
Takanao Tsuyuki
We show that Yukawa couplings of bottom quarks and tau leptons can be unified in a non-supersymmetric SU(5) model. We introduce an arbitrary number of right-handed neutrinos. Their…
Neutrino masses, leptogenesis, and sterile neutrino dark matter
Takanao Tsuyuki
We analyze a scenario in which the lightest heavy neutrino is a dark matter candidate and the second- heaviest neutrino decays producing a lepton number. If were…