  We address the physics of equilibration in ultracold atomic gases following a
quench of the interaction parameter. We focus on the momentum distribution of
the excitations, $n_{\mathbf k}$, and observe that larger ${\mathbf k}$ modes
will equilibrate faster, as has been claimed in recent experimental work. We
identify three time regimes. At short times $n_{\mathbf k}$ exhibits
oscillations; these are damped out at intermediate times where the system
appears to be in a false-equilibrium. Finally, at longer times, full
equilibration occurs. This false-equilibrium is associated with the necessarily
slower relaxation of the condensate which sufficiently high ${\mathbf
k}$-states (of the excitation response) will then quasi-adiabatically follow.
Our work bears on the recent literature focus on interaction quench
experiments. We take issue with the fact that theories to date assume that the
oscillatory regime is adequate for addressing experiments.
