Large-scale cosmic microwave background anisotropies in homogeneous, globally anisotropic cosmologies are investigated. We perform a statistical analysis in which the 4-yr data from the Cosmic Background Explorer satellite is searched for the specific anisotropy patterns predicted by these models and thereby set definitive upper limits on the amount of shear, (σ/H)₀, and vorticity, (ω/H)₀, which are orders of magnitude stronger than previous constraints. We find that primordial anisotropy should have been fine tuned to be less than 10^-3 of its natural value in the Planck era.
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Bunn et al. (1996) studied this question.
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