Abstract
We discuss $K$-theoretic matching of $D$-brane charges in the string duality between type I on ${\mathbb T}^4$ and type IIA on $K3$. This case is more complex than the familiar case of IIA/IIB duality, which is already well understood, but it turns out that replacing $K3$ by its orbifold blow-down seems to largely resolve the apparent problems with the theory.
Citation
Stefan Mendez-Diez. Jonathan Rosenberg. "$K$-theoretic matching of brane charges in S- and U-duality." Adv. Theor. Math. Phys. 16 (6) 1591 - 1618, December 2012.
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