Superhorizon scalar and tensor perturbations in a flat matter-dominated FLRW universe locally mimic Bianchi type I, V, and IX anisotropic cosmologies.
Second, the gradient expansion also intro- duces anisotropic derivatives of R which do not appear in the metric above
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Spatial anisotropies from long wavelength scalar and tensor modes
Superhorizon scalar and tensor perturbations in a flat matter-dominated FLRW universe locally mimic Bianchi type I, V, and IX anisotropic cosmologies.