National Institute of Technology, Miyakonojo College

output

20082024

most citedExact solution for wave scattering from black holes: Formulation

21 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

24 papers

hep-ph2024

Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity

Wenyi Wang, Sousuke Noda, Taishi Katsuragawa

The scalar-tensor theory of gravity, a modified gravity theory, introduces a fundamental scalar field that can serve as dynamical dark energy, driving the late-time accelerated exp…

gr-qc2024★ 4 cited

Hamiltonian Formulation of Relativistic Magnetohydrodynamic Accretion on a General Spherically Symmetric and Static Black Hole: Quantum effects on Shock States

Mustapha Azreg-Aïnou, Mubasher Jamil, Sousuke Noda

In this paper, our aim is to extend our earlier work [A. K. Ahmed et al., Eur. Phys. J. C (2016) 76:280] thereby investigating an axisymmetric plasma flow with the angular momentum…

hep-ph2023★ 11 cited

Leading two-loop corrections to the Higgs di-photon decay in the Inert Doublet Model

Masashi Aiko, Johannes Braathen, Shinya Kanemura

Leading two-loop contributions to the di-photon decay of the Higgs boson are evaluated for the first time in the Inert Doublet Model (IDM). We employ for this calculation the Higgs…

hep-th2022★ 5 cited

High-energy properties of the graviton scattering in quadratic gravity

Yugo Abe, Takeo Inami, Keisuke Izumi

We obtain the matter-graviton scattering amplitude in the gravitational theory of quadratic curvature, which has $R_{μν}^{2}$ term in the action. Unitarity bound is not satisfied bec…

gr-qc2022★ 19 cited

Spectroscopy of Kerr-AdS $_{5}$ spacetime with the Heun function: Quasinormal modes, greybody factor, and evaporation

Sousuke Noda, Hayato Motohashi

We investigate quasinormal modes, greybody factor, and Hawking evaporation of a five-dimensional Kerr-anti de Sitter (AdS $_{5}$ ) black hole by solving a wave equation for a test mass…

gr-qc2022★ 4 cited

Evaporation of Echoing Black Holes

Naritaka Oshita, Hayato Motohashi, Sousuke Noda

We compute the graybody factor and evaporation rate of a rotating black hole in the presence of a hypothetical reflective surface slightly outside the outer horizon radius, assumin…

gr-qc2021

Alfvénic superradiance for a monopole magnetosphere around a Kerr black hole

Sousuke Noda, Yasusada Nambu, Masaaki Takahashi +1

We explore superradiance for Alfvén waves (Alfvénic superradiance) in an axisymmetric rotating magnetosphere of a Kerr black hole within the force-free approximation. On the equato…

astro-ph.HE2021★ 1 cited

One-dimensional force-free numerical simulations of Alfven waves around a spinning black string

Shinji Koide, Sousuke Noda, Masaaki Takahashi +1

We performed one-dimensional force-free magnetodynamic numerical simulations of the propagation of Alfven waves along magnetic field lines around a spinning black-hole-like object,…

gr-qc2021★ 21 cited

Exact solution for wave scattering from black holes: Formulation

Hayato Motohashi, Sousuke Noda

We establish an exact formulation for wave scattering of a massless field with spin and charge by a Kerr-Newman-de Sitter black hole. Our formulation is based on the exact solution…

hep-th2020★ 5 cited

Perturbative $S$ -matrix unitarity ( $S^{†} S = 1$ ) in $R_{μν}^{2}$ gravity

Yugo Abe, Takeo Inami, Keisuke Izumi

We show that in the quadratic curvature theory of gravity, or simply $R_{μν}^{2}$ gravity, the tree-level unitariy bound (tree unitarity) is violated in the UV region but an analog…

hep-ph2018★ 1 cited

Left-right symmetry, orbifold $S^{1} / Z_{2}$ , and radiative breaking of $U (1)_{R} \times U (1)_{B - L}$

Yugo Abe, Yuhei Goto, Yoshiharu Kawamura

We study the origin of electroweak symmetry under the assumption that $S U (4)_{C} \times S U (2)_{L} \times S U (2)_{R}$ is realized on a five-dimensional space-time. The Pa…

hep-th2018★ 8 cited

S-matrix Unitarity and Renormalizability in Higher Derivative Theories

Yugo Abe, Takeo Inami, Keisuke Izumi +2

We investigate the relation between the $S$ -matrix unitarity ( $S S^{†} = 1$ ) and the renormalizability, in theories with negative norm states. The relation has been confirmed in…

hep-th2017★ 7 cited

Matter scattering in $R_{μν}^{2}$ gravity and unitarity

Yugo Abe, Takeo Inami, Keisuke Izumi +1

We investigate the ultraviolet (UV) behavior of two-scalar elastic scattering with graviton exchanges in higher curvature gravity theory. In the Einstein gravity, matter scattering…

hep-ph2017★ 9 cited

Heavy neutrino mixing in the T2HK, the T2HKK and an extension of the T2HK with a detector at Oki Islands

Yugo Abe, Yusuke Asano, Naoyuki Haba +1

We study the discovery potential for the mixing of heavy isospin-singlet neutrinos in extensions of the Tokai-to-Kamioka (T2K) experiment: The Tokai-to-Hyper-Kamiokande (T2HK), the…

math.DG2016

Minimal Darboux transformations

U. Hertrich-Jeromin, A. Honda

We derive a permutability theorem for the Christoffel, Goursat and Darboux transformations of isothermic surfaces. As a consequence we obtain a simple proof of a relation between D…

math.DG2015★ 3 cited

Fold singularities on spacelike CMC surfaces in Lorentz-Minkowski space

Atsufumi Honda, Miyuki Koiso, Kentaro Saji

Fold singular points play important roles in the theory of maximal surfaces. For example, if a maximal surface admits fold singular points, it can be extended to a timelike minimal…

math.DG2015★ 2 cited

Isometric immersions with singularities between space forms of the same positive curvature

Atsufumi Honda

In this paper, we give a definition of coherent tangent bundles of space form type, which is a generalized notion of space forms. Then, we classify their realizations in the sphere…

math.DG2014

The lightlike geometry of marginally trapped surfaces in Minkowski space-time

Atsufumi Honda, Shyuichi Izumiya

The lightlike geometry of codimension two spacelike submanifolds in Lorentz-Minkowski space has been developed in [Izumiya, S. and Romero Fuster, M. C. Selecta Mathematica (NS), 13…

math.DG2014

Intrinsic properties of surfaces with singularities

Masaru Hasegawa, Atsufumi Honda, Kosuke Naokawa +3

In this paper, we give two classes of positive semi-definite metrics on 2-manifolds. The one is called a class of Kossowski metrics and the other is called a class of Whitney metri…

cond-mat.stat-mech2013★ 3 cited

Hamilton-Jacobi method for molecular distribution function in a chemical oscillator

Hiizu Nakanishi, Takahiro Sakaue, Jun'ichi Wakou

Using the Hamilton-Jacobi method, we solve chemical Fokker-Planck equations within the Gaussian approximation and obtain a simple and compact formula for a conditional probability…

cond-mat.soft2013★ 4 cited

Inelastic collapse in one-dimensional driven systems under gravity

Jun'ichi Wakou, Hiroyuki Kitagishi, Takahiro Sakaue +1

We study the inelastic collapse in the one-dimensional $N$ -particle systems in the situation where the system is driven from below under the gravity. We investigate the hard-sphere…

cond-mat.stat-mech2012★ 3 cited

Fluctuation-Dissipation Relations for Motions of Center of Mass in Driven Granular Fluids under Gravity

Jun'ichi Wakou, Masaharu Isobe

We investigated the validity of fluctuation-dissipation relations in the nonequilibrium stationary state of fluidized granular media under gravity by two independent approaches, ba…

cond-mat.stat-mech2010★ 2 cited

A New Approach based on Langevin type Equation for Driven Granular Gas under Gravity