D-Branes on K3-Fibrations
P. Kaste, W. Lerche, C. A. Lutken, J. Walcher
Abstract
B-type D-branes are constructed on two different K3-fibrations over IP1 using boundary conformal field theory at the rational Gepner points of these models. The microscopic CFT charges are compared with the Ramond charges of D-branes wrapped on holomorphic cycles of the corresponding Calabi-Yau manifold. We study in particular D4-branes and bundles localized on the K3 fibers, and find from CFT that each irreducible component of a bundle on K3 gains one modulus upon fibration over IP1. This is in agreement with expectations and so provides a further test of the boundary CFT.
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