Conservation of Momentum

  • Rudolf Kippenhahn
  • Alfred Weigert
  • Achim Weiss
Part of the Astronomy and Astrophysics Library book series (AAL)


Conservation of momentum provides the next basic differential equation of the stellar-structure problem. We will derive this in several steps of gradually increasing generality. The first assumes mechanical equilibrium (Sect. 2.1), the equation of motion for spherical symmetry follows in Sect. 2.4, while in Sect. 2.5 even the assumption of spherical symmetry is dropped. In Sect. 2.6 we briefly discuss general relativistic effects in the case of hydrostatic equilibrium.


Spherical Symmetry Mechanical Equilibrium Mass Element Hydrostatic Equilibrium Gravitational Mass 
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  1. Zeldovich and Novikov(1971).
    Zeldovich, Ya. B., Novikov, I.D. (1971): Relativistic Astrophysics, Vol. I “Stars and Relativity” (University of Chicago Press, Chicago)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Rudolf Kippenhahn
    • 1
  • Alfred Weigert
    • 2
  • Achim Weiss
    • 3
  1. 1.GöttingenGermany
  2. 2.Universität HamburgHamburgGermany
  3. 3.Max-Planck-Institut für AstrophysikGarchingGermany

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