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gr-qc2024★ 9 cited
Null geodesics in extremal Kerr-Newman black holes
Bo-Ruei Chen, Tien Hsieh, Da-Shin Lee
We study the null geodesics in the extremal Kerr-Newman exterior. We clarify the roots of the radial potential and obtain the parameter space of the azimuthal angular momentum and…
gr-qc2024★ 12 cited
Throat effects on strong gravitational lensing in Kerr-like wormholes
Tien Hsieh, Da-Shin Lee, Chi-Yong Lin
We study strong gravitational lensing by a specific one-parameter extension of Kerr spacetime, a Kerr-like wormhole, characterized by a single parameter specifying the throat's loc…
gr-qc2024
Acoustic quasibound states and tachyonic instabilities from binary Bose-Einstein condensates
Wei-Can Syu, Da-Shin Lee
We consider two-component Bose-Einstein condensates (BECs) and introduce the BEC vortex in dimensions. We focus on two types of gapped excitations induced by the modes of two…