5 citations · 12 across the 5 of their papers we have counts for
5 papers
Electromagnetic Energy Extraction in Kerr Black Holes through Frame-Dragging Magnetospheres
Isao Okamoto, Toshio Uchida, Yoogeun Song
It is argued that the zero-angular-momentum-observers (ZAMOs) circulating with the frame-dragging-angular-velocity plays a leading part in energy extraction. When the condition…
Energy self-extraction of a Kerr black hole through its frame-dragged force-free magnetosphere
Isao Okamoto, Yoogeun Song
It is shown that when only the condition} is satisfied, the Kerr black hole frame-drags its surrounding force-free magnetosphere with the field-line-angular…
High-energy and very-high-energy emission from stellar-mass black holes moving in gaseous clouds
Kouichi Hirotani, Hung-Yi Pu, Sabrina Outmani +5
We investigate the electron-positron pair cascade taking place in the magnetosphere of a rapidly rotating black hole. Because of the spacetime frame dragging, the Goldreich-Julian…
Enhanced gamma radiation toward the rotation axis from the immediate vicinity of extremely rotating black holes
Yoogeun Song, Hung-Yi Pu, Kouichi Hirotani +3
We investigate the acceleration of electrons and positrons by magnetic-field-aligned electric fields in the polar funnel of an accreting black hole (BH). Applying the pulsar outer-…
The Influence of the Shear on the Gravitational Waves in the Early Anisotropic Universe
Yoogeun Song, Seok Jae Park
We study the singularity of the congruences for both timelike and null geodesic curves using the expansion of the early anisotropic Bianchi type I Universe. In this paper, we conce…