Brane Transfer Operations and T-Duality of Non-BPS States

Details Brane Transfer Operations and T-Duality of Non-BPS States Brane Transfer Operations and T-Duality of Non-BPS States

1999-02-24

arxiv.org/abs/hep-th/9902160v2

JHEP 9904 (1999) 010

Physics

High Energy Physics

High Energy Physics - Theory

28 pages harvmac, 4 figures; Expanded argument for relative K-theory in subsection 2.2, and added explicit K-theory groups of

Scientific paper

10.1088/1126-6708/1999/04/010

Using the relation between D-brane charges and K-theory, we study non-BPS D-branes and their behavior under T-duality. We point out that in general compactifications, D-brane charges are classified by relative K-theory groups. T-duality is found to act as a symmetry between the relative K-theory groups in Type II and Type I/IA theories. We also study Type \tilde\IA theory (which contains an O8^- plane and an O8^+ plane), using K-theory and T-duality to identify its stable D-branes. Comparison with string theory constructions reveals two interesting effects. One of them involves the transfer of branes between O-planes, while in the other, a D-brane charge which seems conserved near one O-plane in fact decays due to the presence of another type of O-plane.

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