Intersecting brane world from type I compactification

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We elaborate that general intersecting brane models on orbifolds are obtained from type I string compactifications and their T-duals. Symmetry breaking and restoration occur via recombination and parallel separation of branes, preserving supersymmetry. The Ramond-Ramond tadpole cancellation and the toron quantization constrain the spectrum as a branching of the adjoints of SO(32), up to orbifold projections. Since the recombination changes the gauge coupling, the single gauge coupling of type I could give rise to different coupling below the unification scale. This is due to the nonlocal properties of the Dirac-Born-Infeld action. The desirable weak mixing angle sin2 θw = 3/8 is naturally explained by embedding the quantum numbers to those of SO(10).

Original languageEnglish
Pages (from-to)3169-3200
Number of pages32
JournalInternational Journal of Modern Physics A
Issue number19
StatePublished - 30 Jul 2007

Bibliographical note

Funding Information:
The author is grateful to Ralph Blumenhagen, Daniel Cremades, Hans-Peter Nilles, Koji Hashimito, Oscar Loaiza-Brito, Seok Kim, Hyun-Seok Yang and Piljin Yi for useful discussions. This work was partially supported by the European Union 6th Framework Program MRTN-CT-2004-503369 Quest for Unification and MRTN-CT-2004-005104 ForcesUniverse.


  • Intersecting branes
  • Recombination
  • Unification
  • Weak mixing angle


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