Abstract
We present the class of Petrov-typeN, shear-free, perfect-fluid solutions of Einstein's field equations in which the fluid satisfies a barotropic equation of statep=p(w) andw+p≢0. All solutions are stationary and possess a three- parameter, abelian group of local isometries which act simply transitively on timelike hypersurfaces. Furthermore, there exists one Killing vector parallel to the vorticity vector and another parallel to the four-velocity. This class of solutions is identified as part of a larger class present in the literature.
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Carminati, J. Type-N, shear-free, perfect-fluid spacetimes with a barotropic equation of state. Gen Relat Gravit 20, 1239–1248 (1988). https://doi.org/10.1007/BF00756051
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DOI: https://doi.org/10.1007/BF00756051