Kurvature's large-scale white noise is confined to extrinsic shear and expansion; the curvature mode R receives no infrared-divergent contribution from hard-hard modes, invalidating the BIS-II CMB prediction.
For a wave alongˆzthe velocity isv(z,η)ˆz, so the deformation-rate tensor has a single non-vanishing eigendirection, Dij =λˆziˆzj.(A1) 14 The transverse directions are untouched
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Not R Kurvature: Beating Large-Scale White Noise
Kurvature's large-scale white noise is confined to extrinsic shear and expansion; the curvature mode R receives no infrared-divergent contribution from hard-hard modes, invalidating the BIS-II CMB prediction.