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Obstructed D-Branes in Landau-Ginzburg Orbifolds

Sujay K. Ashok, Eleonora Dell'Aquila, Duiliu-Emanuel Diaconescu, Bogdan Florea

hep-tharXiv:hep-th/0404167

Abstract

We study deformations of Landau-Ginzburg D-branes corresponding to obstructed rational curves on Calabi-Yau threefolds. We determine D-brane moduli spaces and D-brane superpotentials by evaluating higher products up to homotopy in the Landau-Ginzburg orbifold category. For concreteness we work out the details for lines on a perturbed Fermat quintic. In this case we show that our results reproduce the local analytic structure of the Hilbert scheme of curves on the threefold.

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