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Zeitschrift für Physik

, Volume 155, Issue 4, pp 498–506 | Cite as

Erhaltungssätze für die Wirkung in elektromagnetischen und gravischen Strahlungsfeldern

  • Jürgen Ehlers
  • Rainer K. Sachs
Article

Abstract

Two generally covariant integral conservation laws concerning electromagnetic null fields and vacuum gravitational fields of type II with vanishing Riemanneigenvalue respectively are proved. The conserved quantities both have the dimensions of action. The electromagnetic law shows that with respect to the propagation of energy a null field may be represented by a stream of photons. The gravitational conservation theorem is in many respects similar to the electromagnetic one; it admits to calculate the change of intensity along a gravitational ray.

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Copyright information

© Springer-Verlag 1959

Authors and Affiliations

  • Jürgen Ehlers
    • 1
  • Rainer K. Sachs
    • 1
  1. 1.Forschungsprofessur für Theoretische Physik der Universität HamburgDeutschland

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