Abstract
It is shown that vacuum solutions of the Einstein field equations, which are of Petrov-typeN, cannot be conformally transformed into nonvacuum perfect fluid space-times.
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Van den Bergh, N. Comment on conformally Ricci-flat perfect fluids of Petrov-typeN . Gen Relat Gravit 19, 1131–1135 (1987). https://doi.org/10.1007/BF00759149
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DOI: https://doi.org/10.1007/BF00759149