Journal of Astrophysics and Astronomy

, Volume 8, Issue 3, pp 257–262 | Cite as

DoH-functions always increase during violent relaxation?

  • S. Sridhar


Recent work on the violent relaxation of collisionless stellar systems has been based on the notion of a wide class of entropy functions. A theorem concerning entropy increase has been proved. We draw attention to some underlying assumptions that have been ignored in the applications of this theorem to stellar dynamical problems. Once these are taken into account, the use of this theorem is at best heuristic. We present a simple counter-example.

Key words

collisionless stellar systems violent relaxation−entropy increase 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. de Jonghe, H. 1987, preprint.Google Scholar
  2. Ehrenfest, P., Ehrenfest, T. 1912.The Conceptual Foundations of the Statistical Approach in Mechanics, 1959, Cornell Univ. Press, New York.Google Scholar
  3. Lynden-Bell, D.1967,Mon. Not. R. astr. Soc.,136, 101.ADSGoogle Scholar
  4. Tolman, R. C. 1938,The Principles of Statistical Mechanics, Clarendon Press, Oxford.Google Scholar
  5. Tremaine, S., Henon, M., Lynden-Bell, D. 1986,Mon. Not. R. astr. Soc.,219, 285.MATHADSGoogle Scholar

Copyright information

© Indian Academy of Sciences 1987

Authors and Affiliations

  • S. Sridhar
    • 1
  1. 1.Joint Astronomy Programme, Department of PhysicsIndian Institute of ScienceBangalore

Personalised recommendations