Intrinsic Gravitational Modes Sustained by Black Hole Collapsing Binaries

• Published in: Plasma physics reports 2021-09, Vol.47 (9), p.878-884
• Main Author: Coppi, B.
• Format: Article
• Language: English
• Subjects: Angular momentum; Atomic; Black holes; Electromagnetic fields; Gravitational fields; Molecular; Optical and Plasma Physics; Phase velocity; Physics; Physics and Astronomy; Space Plasma
• ISSN: 1063-780X; 1562-6938
• DOI: 10.1134/S1063780X21070059

Intrinsic Gravitational Modes (IGM) involving electromagnetic field fluctuations are found that are sustained by the time-dependent tridimensional gravitational field of Black Hole binaries as their collapse is approached. These “disk-rippling” modes, emerging from a plasma disk structure surrounding a binary, have ballooning amplitude profiles in the “vertical” direction (referring to the binary angular momentum vector) and rotate mainly with a frequency of twice the binary rotation frequency in the limit where their phase velocity does not exceed the speed of light. Relevant mode–particle resonances (B. Coppi, Plasma Phys. Rep. 45 , 438 (2019)) can provide a means to transfer energy from high to low energy populations (a process evidenced by laboratory experiments) and offer an explanation for the absence of detectable high-energy radiation emission as the observed collapse of Black Hole binaries is approached. When the disk structure is immersed in a (stationary) magnetic field (B. Coppi, Plasma Phys. Reports. 45 , 438 (2019)), another class of modes, affected by gravity-sustained disk structures, has to be considered.