Particle and Radiation Emission Processes Associated with Plasma Geometry and Gravitational Waves Sources

The problem of understanding the coexistence of gravitational waves emission with that of plasma waves was raised originally without foreseeing [1,2] the presence of low frequency modes, involving the geometry of the plasma structures surrounding gravitational wave emitters. In fact, a class of these (modes) may transfer energy from high energy electron populations to low energy particle populations and prevent the emission of detectable radiation. Two sources of fluctuations are identified: one related to the time dependent gravitational potential produced by a BH binary with a frequency equal or twice the binary rotation frequency and the other one, generating high harmonics, related to the Pulsed Accretion associated with the Swept Torus, carved within the circumbinary disk, by one or both Black Holes. Introducing a magnetic field, to be consistent with the features of observed radiation emission, leads to find torsional modes involving helical magnetic field structures that can propagate away from the circumbinary disk as nonlinearly coupled modes to form a double-helix configuration [3]. Two representative binary cases have been considered: one with two equal masses BH’s and the other with a large BH and a planet BH.



[1] Y.B. Zeldovich, Zh. Eksp. Tear. Fiz. 65, 1311 (1973).

[2] B. Coppi and Y.B. Zeldovich, Enciclopedia del Novecento (1980),

[3] B. Coppi, Invited Papers: XVI M. Grossmann Conf., July 2021, and Asia Pacific Phys. Soc. Conf., Oct. 2021.