• We have achieved the cancellation of nonadiabatic perturbations
with the
assurance that this will hold independent of scale until a~1. With
vanishing cs2, the spatial gradient term is
absent, and the density contrast satisfies
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with the growing mode solution
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• which is our main result: the growing mode overdensities here do not display the damped oscillations of the simple Chaplygin gas below ds but
grow as dust. We remark that it matters little that this applies only for δ > 0 since the
Zel'dovich approximation implies that 92% ends up in overdense regions.