Communications in Mathematical Physics

, Volume 210, Issue 3, pp 621–639 | Cite as

K-Theory, Reality, and Orientifolds

  • Sergei Gukov


We use equivariant K-theory to classify charges of new (possibly non-supersymmetric) 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.


String Theory Brane System Stringy Construction 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Sergei Gukov
    • 1
  1. 1.Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, USA.¶E-mail: gukov@pupgg.princeton.eduUS

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