## Abstract

Just as D-brane charge of type-IIA and type-IIB superstrings is classified, respectively, by K^{1} (X) and K(X), Ramond-Ramond fields in these theories are classified, respectively, by K(X) and K^{1} (X). By analyzing a recent proposal for how to interpret quantum self-duality of RR fields, we show that the Dirac quantization formula for the RR p-forms, when properly formulated, receives corrections that reflect curvature, lower brane charges, and an anomaly of D-brane world-volume fermions. The K-theory framework is important here, because the term involving the fermion anomaly cannot be naturally expressed in terms of cohomology and differential forms.

Original language | English (US) |
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Pages (from-to) | 1-31 |

Number of pages | 31 |

Journal | Journal of High Energy Physics |

Volume | 4 |

Issue number | 5 PART B |

DOIs | |

State | Published - 2000 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

## Keywords

- D-branes
- String Duality
- Superstrings and Heterotic Strings