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We demonstrate that the rapidity and robustness of slow contraction inhomogenizing and flattening the universe found in simulations in which theinitial conditions were restricted to non-perturbative variations described bya single fourier mode along only a single spatial direction are in generalenhanced if the initial variations are along two spatial directions, includemultiple modes, and thereby have reduced symmetry. Particularly significant areshear effects that only become possible when variations are allowed along twoor more spatial dimensions. Based on the numerical results, we conjecture thatthe counterintuitive enhancement occurs because more degrees of freedom areactivated which drive spacetime away from an unstable Kasner fixed point andtowards the stable Friedmann-Robertson-Walker fixed point.

The Effects of Multiple Modes and Reduced Symmetry on the Rapidity and Robustness of Slow Contraction