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astro-ph.HE2025
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 ar…
gr-qc2025
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…
astro-ph.HE2025
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…