title: Three-wave interaction in a self-gravitating fluid.
abstract: Nonlinear three-wave interaction is investigated in rotating self-gravitating astrophysical fluids. Both direct and inverse cascades are found. The latter should be of importance for the formation of structures in rotating astrophysical objects like protogalaxies and galaxies. Linear gravitational instability is shown to be a process that develops on much longer time scales, compared to the nonlinear wave interaction, and the nonlinear precipitation of energy from the linearly unstable, slowly contracting mode towards smaller spatial and time scales is shown to be possible.
authors.affiliation: Center for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium. jvranjes@yahoo.com
authors.forename: J
authors.initials: J
authors.lastname: Vranjes
authors.forename: S
authors.initials: S
authors.lastname: Poedts