## Abstract

A recent proposal for 6d "gauge" theories with rational theta angle is discussed. These theories were constructed from n_{C} coinciding (p, q) 5-branes of IIB in the limit of vanishing string constant. They have (1,1) supersymmetry and the low energy theory is 6d Yang-Mills with gauge group SU(n_{c}) and a rational theta angle θ_{6}/2π = f/q, where fp = 1 (mod q). By changing the point of view, considering the (p, q) 5-branes to be D5-branes, the 6d theta angle is identified with a 10d theta angle. This point of view together with some assumptions suggests a generalization of the previous limit to arbitrary theta. This limit seems to define a decoupled 6d theory even though the 10d theory does not become free in general.

Original language | American English |
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Pages (from-to) | XXVII-5 |

Journal | Journal of High Energy Physics |

Volume | 3 |

Issue number | 11 |

DOIs | |

State | Published - 1999 |

Externally published | Yes |

## Keywords

- Brane Dynamics in Gauge Theories
- Field Theories in Higher Dimensions