W B Bonnor 2001 Class. Quantum Grav. 18 233 doi:10.1088/0264-9381/18/2/303
W B Bonnor
Show affiliationsThe double-series method is used to investigate the Newman-Penrose quantities (NPQ) in the case of an axially symmetric isolated source which oscillates for a finite time. In this case there is a single NPQ. It is found that in part of spacetime this quantity is not defined because of the divergence of the Bondi-Sachs expansion used to derive it. The NPQ is conserved where it is defined, but I argue that the conservation has little physical importance.
Issue 2 (21 January 2001)
Received 7 August 2000
W B Bonnor 2001 Class. Quantum Grav. 18 233
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