Consistency Conditions for Orientifolds and D-Manifolds

Details Consistency Conditions for Orientifolds and D-Manifolds Consistency Conditions for Orientifolds and D-Manifolds

1996-01-09

arxiv.org/abs/hep-th/9601038v3

Phys.Rev.D54:1667-1676,1996

Physics

High Energy Physics

High Energy Physics - Theory

Reference added. 27 pages LaTeX, 2 epsf figures. To appear in Phys.Rev.D (15Jly96)

Scientific paper

10.1103/PhysRevD.54.1667

We study superstrings with orientifold projections and with generalized open string boundary conditions (D-branes). We find two types of consistency condition, one related to the algebra of Chan-Paton factors and the other to cancellation of divergences. One consequence is that the Dirichlet 5-branes of the Type I theory carry a symplectic gauge group, as required by string duality. As another application we study the Type I theory on a $K3$ $Z_2$ orbifold, finding a family of consistent theories with various unitary and symplectic subgroups of $U(16) \times U(16)$. We argue that the $K3$ orbifold with spin connection embedded in gauge connection corresponds to an interacting conformal field theory in the Type I theory.

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