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\(K\)-theory, reality, and orientifolds. (English) Zbl 0968.81059
Summary: We use equivariant \(K\)-theory to classify charges of new (possibly non-super-symmetric) states localized on various orientifolds in Type II string theory. We also comment on the stringy construction of new D-branes and demonstrate the discrete electric-magnetic duality in Type I brane systems with \(p+q=7\), as proposed by Witten.

MSC:
81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
81T60 Supersymmetric field theories in quantum mechanics
19L47 Equivariant \(K\)-theory
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