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KIAM Preprint № 44, Moscow, 2022
Authors: Kolesnichenko A.V.
Jeans gravitational instability of a magnetized rotating collision-less anisotropic plasma using generalized laws of double polytropy
Abstract:
The problem of gravitational instability of an astrophysical magnetized rotating plasma with an anisotropic pressure tensor is investigated on the basis of the quasi-hydrodynamic Chew-Goldberger-Low (CGL) equations, modified by using generalized laws of dual polytropic theory. Using a general form of the dispersion relation obtained by the normal mode method, we discuss the propagation of oscillating magneto-hydrodynamic waves of small amplitude perturbation in an infinite homogeneous plasma medium for the transverse, longitudinal and inclined directions with respect to the magnetic field vector. A number of modified Jeans gravitational instability criteria obtained for isotropic MHD and anisotropic CGL equations of rarefied plasma and distinguished by different orientations of the vectors of propagation of the disturbing wave, magnetic field, and rotation axis of the hydromagnetic fluid are analyzed. It is shown that rotation and anisotropic pressure not only change the classical criterion of gravitational instability of astrophysical magnetized plasma, but also cause new unstable regions.
Keywords:
anisotropic rarefied plasma, Jeans gravitational criterion for instability, Chu-Goldberger-Low equations modified by new laws of polytropy
Publication language: russian,  pages: 27
Research direction:
Mathematical modelling in actual problems of science and technics
Russian source text:
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About authors:
  • Kolesnichenko Aleksandr Vladimirovich,  orcid.org/0000-0003-1416-5634KIAM RAS