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Instantons on D-branes
Cumrun Vafa
We consider type IIA compactification on . We show that the instanton subsectors of the worldvolume of 4-branes wrapped around lead to a Hagedorn density of BPS states…
D-Strings on D-Manifolds
M. Bershadsky, V. Sadov, C. Vafa
We study the mechanism for appearance of massless solitons in type II string compactifications. We find that by combining -duality with strong/weak duality of type IIB in 10 dim…
D-Branes and Topological Field Theories
M. Bershadsky, V. Sadov, C. Vafa
In the presence of a D-brane a string theory develops a new subsector. We show that for curved D-branes the corresponding sector is a (partially twisted) topological field theory.…
Two-Dimensional Black Hole and Singularities of CY Manifolds
Hirosi Ooguri, Cumrun Vafa
We study the degenerating limits of superconformal theories for compactifications on singular K3 and Calabi-Yau threefolds. We find that in both cases the degeneration involves cre…
Gas of D-Branes and Hagedorn Density of BPS States
Cumrun Vafa
We test the prediction of a hagedorn density of BPS states which carry RR charge in type II compactifications. We find that in certain cases they correspond to the supersymmetric g…
Nonperturbative Results on the Point Particle Limit of N=2 Heterotic String Compactifications
S. Kachru, A. Klemm, W. Lerche +2
Using heterotic/type II string duality, we obtain exact nonperturbative results for the point particle limit (alpha' -> 0) of some particular four dimensional, N=2 supersymmetric c…