Figure 11

Figure 11: The simulated behaviour of a mode on superhorizon scales. On the left we show how the Δ gauge invariant switches from the high-energy behaviour predicted to the familiar GR result as the universe expands through the critical epoch. We also show how the KK anisotropic stress 2 κ4δπℰ steadily decays throughout the simulation, which is typical of all the cases we have investigated. On the right, we show the metric perturbations ψ (= Ψ ) and ℛ (= Φ) as well as the curvature perturbation ζ. Again, note how the GR result Φ ≈ − Ψ ≈ − 2ζ∕3 is recovered at low energy. Figure taken from [69].