What damps small perturbations in stellar systems?

Details What damps small perturbations in stellar systems? What damps small perturbations in stellar systems?

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..687m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 10, 1991, p. 687-690.

Astronomy and Astrophysics

Astrophysics

4

Cosmic Plasma, Landau Damping, Stellar Systems, Stellar Gravitation, Stellar Motions

Scientific paper

A relaxation mechanism analogous to Landau damping in plasma is commonly believed to play a significant role in damping perturbations. However, a detailed calculation for the gravitational case shows that the significance of this process has been greatly overestimated. Landau's mechanism is found to have a negligible contribution for damping perturbations on the entire range of stable waves, even on scales as large as the Jeans length. Damping of all stable modes in stellar systems is due virtually entirely to phase mixing.

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