Abstract
A slow rotation perturbation of Robertson-Walker universes filled with perfect fluid has been investigated. It is found that the unit-four vector of perfect fluid hasno angular velocity in the perturbed cosmological models. The slow rotation which is related to the dragging of the local inertial frames, is compatible only with the cases of positive and negative curvatures of the cosmological universe. The intrinsic velocity vector field of the Universe isexpanding as well asshearing.
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Ibohal Singh, N. Slow rotational perturbations of Robertson-Walker universes. Astrophys Space Sci 148, 199–205 (1988). https://doi.org/10.1007/BF00645959
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DOI: https://doi.org/10.1007/BF00645959