## Abstract

We re-examine the question of heterotic/heterotic string duality in six dimensions and argue that the E_{8} × E_{8} heterotic string, compactified on K3 with equal instanton numbers in the two E_{8}'s, has a self-duality that inverts the coupling, dualizes the antisymmetric tensor, acts non-trivially on the hypermultiplets, and exchanges gauge fields that can be seen in perturbation theory with gauge fields of a non-perturbative origin. The special role of the symmetric embedding of the anomaly in the two E_{8}'s can be seen from field theory considerations or from an eleven-dimensional point of view. The duality can be deduced by looking in two different ways at eleven-dimensional M-theory compactified on K3 × S^{1} /ℤ_{2}.

Original language | English (US) |
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Pages (from-to) | 413-438 |

Number of pages | 26 |

Journal | Nuclear Physics B |

Volume | 465 |

Issue number | 3 |

DOIs | |

State | Published - Apr 22 1996 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

## Keywords

- Anomalies
- Duality
- Instantons
- M-theory
- String theory