Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-10-30
Nucl.Phys. B463 (1996) 398-414
Physics
High Energy Physics
High Energy Physics - Theory
23 pages, with 3 figures. A compact example is added
Scientific paper
10.1016/0550-3213(96)00024-7
We study the mechanism for appearance of massless solitons in type II string compactifications. We find that by combining $T$-duality with strong/weak duality of type IIB in 10 dimensions enhanced gauge symmetries and massless solitonic hypermultiplets encountered in Calabi-Yau compactifications can be studied perturbatively using D-strings (the strong/weak dual to type IIB string) compactified on ``D-manifolds''. In particular the nearly massless solitonic states of the type IIB compactifications correspond to elementary states of D-strings. As examples we consider the D-string description of enhanced gauge symmetries for type IIA string compactification on ALE spaces with $A_n$ singularities and type IIB on a class of singular Calabi-Yau threefolds. The class we study includes as a special case the conifold singularity in which case the perturbative spectrum of the D-string includes the expected massless hypermultiplet with degeneracy one.
Bershadsky Maxim
Sadov Vladimir
Vafa Cumrun
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