Stability of particulate discs

Details Stability of particulate discs Stability of particulate discs

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988em%26p...43...61h&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 43, Oct. 1988, p. 61-86.

Physics

8

Accretion Disks, Gravitational Effects, Particle Collisions, Protoplanets, Stability, Condensation, Elastic Scattering, Orbital Velocity, Perturbation

Scientific paper

Collisionally-induced amplification of density fluctuations can also produce nonaxisymmetric local condensations in particulate disks if the optical thickness is between definite values. Gravitational instability occurs above this interval. The theory of both phenomena is derived from collisional equations. These instabilities can produce an unbounded growth in density or a gravitational coagulation of particles, but the typical consequence is the formation of highly elongated clouds which are denser than the background matter and have a relatively long lifetime before decay. The third type of instability, the thermal one, appears at low values of velocity dispersion. It only affects the random motion of particles, without producing condensations.

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