A chiral {ital N}=1 type I vacuum in four dimensions and its heterotic dual
- Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)
- Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853-5001 (United States)
In this paper we consider type I string theory compactified on a {bold Z}{sub 7} orbifold. The model has N=1 supersymmetry, a U(4){circle_times}U(4){circle_times}U(4){circle_times}SO(8) gauge group, and chiral matter. There are only D9-branes (for which we discuss tadpole cancellation conditions) in this model corresponding to a perturbative heterotic description in a certain region of the moduli space. We construct the heterotic dual, match the perturbative type I and heterotic tree-level massless spectra via giving certain scalars appropriate vacuum expectation values, VEVs, and point out the crucial role of the perturbative superpotential (on the heterotic side) for this matching. The relevant couplings in this superpotential turn out to be nonrenormalizable (unlike the Z-orbifold case discussed by Kakushadze, where Yukawa couplings sufficed for duality matching). We also discuss the role of the anomalous U(1) gauge symmetry present in both type I and heterotic models. In the perturbative regime we match the (tree-level) moduli spaces of these models. We point out possible generalizations of the {bold Z}{sub 3} and {bold Z}{sub 7} cases to include D5-branes which would help in understanding nonperturbative five-brane dynamics on the heterotic side. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 542344
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 6 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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