0 not worried about something, especially when this is slightly surprising: --
Results have been presented only for the case when the unperturbed configuration is plane.
In what follows, the subscript '0' indicates an unperturbed quantity.
Again, their recovery to the unperturbed condition is slow and consistent with other results discussed above.
The mixing region, of course, does not exist for the unperturbed case.
It is convenient to transform the equation to a reduced-variables coordinate system moving with the unperturbed soliton.
We assume that the unperturbed plasma is neutral.
For the constant velocity piston, the perturbation particle velocity a t the unperturbed piston location is zero.
The front of the drop always regains its unperturbed spherical shape.
