Spin induction from scattering of two spinning black holes in dense clusters
Year: 2024
Type: article
Abstract: In this paper, we use numerical relativity to study the spin induction effect within close hyperbolic encounters of initially spinning black holes. We review the initially non-spinning case and explore the cases of initially aligned, anti-aligned and orthogonal spins with respect to the orbital angular momentum L → . We find that, for a given initial effective spin, the black hole with a smaller initial spin acquires a greater spin-up than the other black hole after the interaction. We study three different scenarios regarding initial effective spin ( χ eff = − 0 . 1 , 0 . 0 , 0 . 1 ), using three different scattering angles in order to obtain maximally spin-inducing scenarios. We also find that the final effective spin-ups with respect to the initial spins are well-fitted by a parabola. For spins orthogonal to L → , we observe that the black hole spins precess, and that the induced spin in the z -direction depends quadratically on the value of the initial spins. These phenomena suggest that dense black hole clusters present a rich spin dynamics , where black hole spins may acquire non-trivial distributions.
Source: Physics of the Dark Universe
Institutions: Universidad Autónoma de Madrid, Instituto de Física Teórica
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,240
OpenAlex ID: W4405526768