Abstract
We construct the explicit boundary state description of
the vortex-type (codimension two) tachyon condensation in
brane-antibrane systems generalizing the known result of the
kink-type (Frau et al. hep-th/9903123). In this description we
show how the RR-charge of the lower-dimensional D-branes emerges.
We also investigate the tachyon condensation in
4/
2 orbifold and find that the twisted
sector can be treated almost in the same way as the untwisted
sector from the viewpoint of the boundary state. Further we
discuss the higher codimension cases.