Entropy and angular momentum transport in spiral density waves

Details Entropy and angular momentum transport in spiral density waves Entropy and angular momentum transport in spiral density waves

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..315k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 315-320.

Astronomy and Astrophysics

Astrophysics

1

Angular Momentum, Density Wave Model, Entropy, Galactic Structure, Momentum Transfer, Stellar Systems, Galactic Evolution, Nonlinear Equations, Perturbation Theory, Plane Waves, Vlasov Equations

Scientific paper

The non-linear Vlasov equation is studied with respect to the transport of entropy and angular momentum in a stellar system under the influence of a spiral density wave. It is pointed out that the true (fine-grained) entropy is transported only by convection, while the time variation of the densities of angular momentum and a kind of coarse grained entropy are affected also by the wave-star interaction. An exact relation is derived giving the local exchange of angular momentum between the wave and the stars, once the disturbance is specified. For the selfconsistent problem, finally, a relation is given, which has to be satisfied, if one requires the system to be stationary, i.e. non-evolving.

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