D-strings in unconventional type I vacuum configurations

Details D-strings in unconventional type I vacuum configurations D-strings in unconventional type I vacuum configurations

1998-11-02

arxiv.org/abs/hep-th/9811013v2

Nucl.Phys.B547:96-126,1999

Physics

High Energy Physics

High Energy Physics - Theory

30 pages, Latex. Typos corrected. Reference added. Version to appear in Nuclear Physics B

Scientific paper

10.1016/S0550-3213(99)00004-8

We determine the spectrum of D-string bound states in various classes of generalized type I vacuum configurations with sixteen and eight supercharges. The precise matching of the BPS spectra confirms the duality between unconventional type IIB orientifolds with quantized NS-NS antisymmetric tensor and heterotic CHL models in D=8. A similar analysis puts the duality between type II (4,0) models and type I strings {\it without open strings} on a firmer ground. The analysis can be extended to type II (2,0) asymmetric orbifolds and their type I duals that correspond to unconventional K3 compactifications. Finally we discuss BPS-saturated threshold corrections to the correponding low-energy effective lagrangians. In particular we show how the exact moduli dependence of some F^4 terms in the eight-dimensional type II (4,0) orbifold is reproduced by the infinite sum of D-instanton contributions in the dual type I theory.

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