4 papers
Unified understanding of Alfvénic superradiance and the Blandford-Znajek process in a force-free black hole magnetosphere
Sousuke Noda, Masaaki Takahashi
We investigate the extraction of energy from a Kerr black hole via Alfvén waves (i.e., Alfvénic superradiance) in a force-free magnetosphere, in which the plasma inertia effects…
Weyl symmetry of the gradient-flow in information geometry
Tatsuaki Wada, Sousuke Noda
We have revisited the gradient-flow in information geometry from the perspective of Weyl symmetry. The gradient-flow equations are derived from the proposed action which is invaria…
One-dimensional linear analysis and numerical simulations of Alfven waves in a force-free magnetosphere around a Kerr black hole
Shinji Koide, Sousuke Noda, Masaaki Takahashi
We perform one-dimensional linear analysis and numerical simulations of the propagation of Alfven waves in a force-free magnetosphere along magnetic field lines around a spinning b…
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…