3 papers
gr-qc2026
Conformal-Mapping Method for Horizon Multipoles in Numerical Relativity: Implementation, Kerr Validation, and Applications Beyond Axisymmetry
Yeong-Bok Bae, Young-Hwan Hyun, Gungwon Kang
We present a numerical method that constructs geometrically defined coordinates on black-hole horizons, from which the multipole moments are computed without assuming axisymmetry.…
hep-th2024
Scalar Field Perturbation of Hairy Black Holes in EsGB theory
Young-Hwan Hyun, Boris Latosh, Miok Park
We investigate scalar field perturbations of the hairy black holes involved with spontaneous symmetry breaking of the global U(1) symmetry in Einstein-scalar-Gauss-Bonnet theory fo…
gr-qc2023
Ringdown gravitational waves from close scattering of two black holes
Yeong-Bok Bae, Young-Hwan Hyun, Gungwon Kang
We have numerically investigated close scattering processes of two black holes (BHs). Our careful analysis shows for the first time a non-merging ringdown gravitational wave coming…