D=4,N=1, Type IIB Orientifolds

Details D=4,N=1, Type IIB Orientifolds D=4,N=1, Type IIB Orientifolds

1998-04-02

arxiv.org/abs/hep-th/9804026v2

Nucl.Phys. B536 (1998) 29-68

Physics

High Energy Physics

High Energy Physics - Theory

46 pages, Latex. References, acknowledgement and minor changes added

Scientific paper

10.1016/S0550-3213(98)00666-X

We study different aspects of the construction of D=4, N=1 type IIB orientifolds based on toroidal Z_N and Z_M x Z_N, D=4 orbifolds. We find that tadpole cancellation conditions are in general more constraining than in six dimensions and that the standard Gimon-Polchinski orientifold projection leads to the impossibility of tadpole cancellations in a number of Z_N orientifolds with even N including Z_4, Z_8, Z_8' and Z_{12}'. We construct D=4, Z_N and Z_N x Z_M orientifolds with different configurations of 9-branes, 5-branes and 7-branes, most of them chiral. Models including the analogue of discrete torsion are constructed and shown to have features previously conjectured on the basis of F-theory compactified on four-folds. Different properties of the D=4, N=1 models obtained are discussed including their possible heterotic duals and effective low-energy action. These models have in general more than one anomalous U(1) and the anomalies are cancelled by a D=4 generalized Green-Schwarz mechanism involving dilaton and moduli fields.

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