Obtaining a class of Type O pure radiation metrics with a cosmological constant, using invariant operators

Details Obtaining a class of Type O pure radiation metrics with a cosmological constant, using invariant operators Obtaining a class of Type O pure radiation metrics with a cosmological constant, using invariant operators

2006-04-24

arxiv.org/abs/gr-qc/0604103v1

Gen.Rel.Grav.39:539-566,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

29 pages

Scientific paper

10.1007/s10714-006-0392-0

Using the generalised invariant formalism we derive a class of conformally flat spacetimes whose Ricci tensor has a pure radiation and a Ricci scalar component. The method used is a development of the methods used earlier for pure radiation spacetimes of Petrov types O and N respectively. In this paper we demonstrate how to handle, in the generalised invariant formalism, spacetimes with isotropy freedom and rich Killing vector structure. Once the spacetimes have been constructed, it is straightforward to deduce their Karlhede classification: the Karlhede algorithm terminates at the fourth derivative order, and the spacetimes all have one degree of null isotropy and three, four or five Killing vectors.

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