On entropy and stellar systems

Details On entropy and stellar systems On entropy and stellar systems

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..477d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 477-481.

Physics

Condensed Matter

Statistical Mechanics

19

Entropy, Galactic Evolution, Probability Distribution Functions, Statistical Mechanics, Stellar Motions, Stellar Systems, Hydrodynamics, Star Distribution

Scientific paper

The Tolman proof on the increase of entropy in a collisionless stellar system is discussed; it is emphasized that it does not prove that generalized H-functions are monotonically increasing in time and that it cannot be invoked to justify an arbitrary convex H-function as a basis for a variational principle. On the other hand, there are entropies that can be given a statistical foundation: the Jaynes entropy is introduced and an application is discussed. The results are of interest in theories of galactic formation and may also be applied in galaxy modeling.

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