Theoretical analysis reveals that introducing anisotropy without spin fails to resolve core issues in isotropic cosmological models, suggesting rotation is necessary.
The paper presents some general relations obtaining in relativistic cosmology. It appears from these that a simple change over to anisotropy without the introduction of spin does not solve any of the outstanding difficulties of isotropic cosmological models.
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Amalkumar Raychaudhuri (1955) studied this question.
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