TL;DR
This paper argues that D-brane charges are classified by K-theory of spacetime, providing new insights into D-brane objects and their stability, especially in nonsupersymmetric contexts.
Contribution
It establishes that D-brane charge values are given by K-theory, offering a novel framework for understanding D-branes and related objects in string theory.
Findings
D-brane charge classified by K-theory of spacetime
Identification of new objects like the -1-brane in Type I string theory
Enhanced understanding of nonsupersymmetric D-brane states
Abstract
By exploiting recent arguments about stable nonsupersymmetric D-brane states, we argue that D-brane charge takes values in the K-theory of spacetime, as has been suspected before. In the process, we gain a new understanding of some novel objects proposed recently - such as the Type I zerobrane - and we describe some new objects - such as a -1-brane in Type I superstring theory.
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