  We search for tubular solutions in unstable D3-brane. With critical electric
field E=1, solutions representing supertubes, which are supersymmetric bound
states of fundamental strings, D0-branes, and a cylindrical D2-brane, are found
and shown to exhibit BPS-like property. We also point out that boosting such a
{\it tachyon tube} solution generates string flux winding around the tube,
resulting in helical electric fluxes on the D2-brane. We also discuss issues
related to fundamental string, absence of magnetic monopole, and finally more
tachyon tubes with noncritical electric field.

High Energy Physics - Theory