Remarks on Non-BPS D-Branes
arXiv:hep-th/9908091 · doi:10.1088/0264-9381/17/5/333
Abstract
Following Sen's discovery of various stable non-BPS D-branes, K-theory has been shown to be the appropriate mathematical framework for classifying conserved D-brane charges. The classification accounts for known D-branes and predicts some new ones including a D8-brane in type I superstring theory. After briefly reviewing these developments, we discuss certain issues pertaining to the D8-brane, which is unstable.
8 pages; Submitted to Proceedings of Strings 99