Entropy in Collisionless Self-gravitating Systems

Details Entropy in Collisionless Self-gravitating Systems Entropy in Collisionless Self-gravitating Systems

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530205b&link_type=abstract

American Astronomical Society, AAS Meeting #215, #302.05; Bulletin of the American Astronomical Society, Vol. 42, p.299

Astronomy and Astrophysics

Astronomy

Scientific paper

Collisionless systems, like simulated dark matter halos or gas-less elliptical galaxies, often times have properties suggesting that a common physical principle controls their evolution. For example, N-body simulations of dark matter halos present nearly scale-free density/velocity-cubed profiles. In an attempt to understand the origins of such relationships, we adopt a thermodynamics approach. While it is well-known that self-gravitating systems do not have physically realizable thermal equilibrium configurations, we are interested in the behavior of entropy as mechanical equilibrium is acheived. We will discuss entropy production in these systems from a kinetic theory point of view. This material is based upon work supported by the National Aeronautics and Space Administration under grant NNX07AG86G issued through the Science Mission Directorate.

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