Tachyon tube and supertube

We search for tubular solutions in unstable D3-brane. With critical electricfield E=1, solutions representing supertubes, which are supersymmetric boundstates of fundamental strings, D0-branes, and a cylindrical D2-brane, are foundand 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 issuesrelated to fundamental string, absence of magnetic monopole, and finally moretachyon tubes with noncritical electric field.Comment: 21 pages, 3 figure