Integration in the GHP formalism I: A coordinate approach with applications to twisting type N spaces

Details Integration in the GHP formalism I: A coordinate approach with applications to twisting type N spaces Integration in the GHP formalism I: A coordinate approach with applications to twisting type N spaces

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gregr..28..707l&link_type=abstract

General Relativity and Gravitation, Volume 28, Issue 6, pp.707-733

Computer Science

10

Scientific paper

The compacted spin coefficient ( ghp) formalism is clearly more concise and efficient than the older Newman-Penrose formalism. Yet few people use it when integration of the field equations is involved, Held being the notable exception. However, to most workers in the field, Held's approach seems far removed from the usual Newman-Unti ( nu) type integration procedure. This paper and a subsequent one are concerned with integration within the ghp formalism. In this first paper we develop a ghp coordinate-style integration procedure modelled closely on the nu procedure whereas in the second paper we present a ghp operator-style integration procedure along the lines suggested by Held. For simplicity of illustration we restrict the discussion to algebraically special vacuum spacetimes. We show clearly the similarities and differences between the two approaches, and compare their respective efficiencies. To deal with a concrete example, we illustrate the two methods by once more considering the problem of twisting typeN vacuum solutions to Einstein's field equations. The Ghp approach enables us to have a comprehensive overview of this much discussed problem and gain new insight into the relationship between various results derived in a number of different formalisms.

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