Jeans Instability of a Protoplanetary Gas Cloud with Radiation in Nonextensive Tsallis Kinetics

— In the framework of Tsallis statistics, we study the effect of medium nonextensivity on the Jeans gravitational instability criterion for a self-gravitating protoplanetary cloud, the substance of which consists of a mixture of perfect gas and blackbody radiation. Generalized Jeans instability crit...

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Published in:Solar system research 2020-03, Vol.54 (2), p.137-149
Main Author: Kolesnichenko, A. V.
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Language:English
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Astronomy
Astrophysics and Astroparticles
Astrophysics and Cosmology
Observations and Techniques
Physics
Physics and Astronomy
Planetology
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description — In the framework of Tsallis statistics, we study the effect of medium nonextensivity on the Jeans gravitational instability criterion for a self-gravitating protoplanetary cloud, the substance of which consists of a mixture of perfect gas and blackbody radiation. Generalized Jeans instability criteria have been found from the corresponding dispersion relations obtained both for a uniform cloud with radiation and for a rotating protoplanetary cloud. An integral generalized Chandrasekhar stability criterion for a gravitating spherical cloud has also been obtained. The presented results are analyzed for various values of deformation parameters dimensionality of the velocity space and coefficient , characterizing the fraction of radiation in the total pressure of the system. It is shown that radiation stabilizes the substance of nonextensive protoplanetary clouds, and for rotating clouds, the Jeans instability criterion is modified by the Coriolis force only in the transverse modes of perturbation wave propagation.
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subjects Astronomy
Astrophysics and Astroparticles
Astrophysics and Cosmology
Observations and Techniques
Physics
Physics and Astronomy
Planetology
title Jeans Instability of a Protoplanetary Gas Cloud with Radiation in Nonextensive Tsallis Kinetics
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