## Abstract

Based on a simple adiabatic argument and by considering the heterotic string counterpart of certain symmetries of Type II superstrings such as (-1)^{FL} and orientation reversal, we construct orbifold candidates for dual pairs of heterotic and Type II string theories with N = 2 and N = 1 supersymmetry. We also analyze from a similar point of view the K3 fibrations that enter in recently proposed N = 2 candidates and use this structure together with certain orientation-reversing symmetries to construct N = 1 dual pairs. These pairs involve generalizations of Type I vacua which can be equivalent to E_{8} × E_{8} heterotic strings, while standard Type I vacua are related to SO(32).

Original language | English (US) |
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Pages (from-to) | 225-247 |

Number of pages | 23 |

Journal | Nuclear Physics B - Proceedings Supplements |

Volume | 46 |

Issue number | 1-3 |

DOIs | |

State | Published - Mar 1996 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics