### Abstract

It is well known that the SO(32) and E_{8} × E_{8} heterotic strings can be continuously connected to each other in nine dimensions. Since the strong-coupling duals of these theories are respectively the SO(32) Type I theory and M-theory compactified on a line segment, there should be a corresponding continuous connection between the Type I string and M-theory. In this paper, we give an explicit construction of this dual connecting theory. Our construction also enables us to realize the E_{8} × E_{8} heterotic string as a D-string soliton of the Type I theory. This provides a useful alternative description of the D-brane bound states previously discussed from a Type I′ point of view.

Original language | English (US) |
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Pages (from-to) | 93-104 |

Number of pages | 12 |

Journal | Nuclear Physics B |

Volume | 520 |

Issue number | 1-2 |

Publication status | Published - Jun 1 1998 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Nuclear Physics B*,

*520*(1-2), 93-104.