  In a linear dilaton background, it has been argued that an unstable D-brane
can decay to the tachyon vacuum without leaving behind a remnant of tachyon
matter. Here we address the question of how the D-brane can decay to the
tachyon vacuum when the tachyon vacuum does not support physical fluctuations.
Using the formalism of open string field theory, we find that the tachyon
vacuum {\it can} support fluctuations provided they are "hidden" as
nonperturbative effects behind a pure gauge asymptotic series.

High Energy Physics - Theory