Research Articles

General Relativity and Gravitation

, Volume 21, Issue 7, pp 741-745

Conserved quantities from piecewise Killing vectors

  • Tevian DrayAffiliated withTata Institute of Fundamental Research
  • , T. PadmanabhanAffiliated withTata Institute of Fundamental Research

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In the presence of symmetries, conserved quantities can be obtained by contracting the stress-energy tensor with a Killing vector. We generalize this result to piecewise Killing vectors by giving sufficient conditions for the construction of an associated conserved quantity. A typical example, namely, two stationary space-times joined together in such a way that the resulting space-time is not stationary, is treated in detail.