Carlos Kozameh and Ezra T Newman 2007 Class. Quantum Grav. 24 3085 doi:10.1088/0264-9381/24/11/019
Asymptotically shear-free and twist-free null geodesic congruences
Carlos Kozameh1 and Ezra T Newman2
Show affiliationsThe Robinson–Trautman spacetime is a special case of asymptotically flat spacetimes that possess asymptotically shear-free and twist-free (surface forming) null geodesic congruences. In this paper we show that, although they are rare, a larger class of asymptotically flat spacetimes with this property does exist. In particular, we display the class of spacetimes that possess this dual property and demonstrate how these congruences can be found. In addition, we show that in each case the congruence is isolated in the sense that there are no other neighbouring congruences with this dual property.
- PACS
- MSC
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83C30 Asymptotic procedures (radiation, news functions, H-spaces, etc.)
- Subjects
- Dates
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Issue 11 (7 June 2007)
Received 20 March 2007, in final form 26 April 2007
Published 22 May 2007
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Asymptotically shear-free and twist-free null geodesic congruences
Carlos Kozameh and Ezra T Newman 2007 Class. Quantum Grav. 24 3085
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