Asymmetric Orbifolds, Noncommutative Geometry and Type I String Vacua

Details Asymmetric Orbifolds, Noncommutative Geometry and Type I String Vacua Asymmetric Orbifolds, Noncommutative Geometry and Type I String Vacua

2000-03-03

arxiv.org/abs/hep-th/0003024v2

Nucl.Phys.B582:44-64,2000

Physics

High Energy Physics

High Energy Physics - Theory

TeX, harvmac, 24 pages, 2 figures, v2: Clarifying remarks concerning the identification of commutative and non-commutative the

Scientific paper

10.1016/S0550-3213(00)00270-4

We investigate the D-brane contents of asymmetric orbifolds. Using T-duality we find that the consistent description of open strings in asymmetric orbifolds requires to turn on background gauge fields on the D-branes. We derive the corresponding noncommutative geometry arising on such D-branes with mixed Neumann-Dirichlet boundary conditions directly by applying an asymmetric rotation to open strings with pure Dirichlet or Neumann boundary conditions. As a concrete application of our results we construct asymmetric type I vacua requiring open strings with mixed boundary conditions for tadpole cancellation.

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