Shearfree and conformally Ricci-flat per
β
N. Bergh
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Article
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1986
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Springer
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English
β 167 KB
A proof is given that shearfree perfect fluids, the metric of which is conformally related to a vacuum solution, are either of Petrov type D, as well as locally rotationally symmetric, or are conformally flat. In both cases the general solutions are well known.