Figure 12: Density perturbation enhancement factors (left) and transfer functions (right) from
simulations, effective theory, and general relativity. All of the factors monotonically increase with
, and we see that the amplitude enhancement due to effects is generally
larger than the enhancement due to KK effects . For asymptotically small scales , the
enhancement seems to level off. The transfer functions in the right panel are evaluated at a given
subcritical epoch in the radiation dominated era. The functions show how, for a fixed primordial
spectrum of curvature perturbations , the effective theory predicts excess power in the
spectrum on supercritical/subhorizon scales compared to the GR result. The excess
small-scale power is even greater when KK modes are taken into account, as shown by .
Figure taken from [69].
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