An index for the Dirac operator on D3 branes with background fluxes

Details An index for the Dirac operator on D3 branes with background fluxes An index for the Dirac operator on D3 branes with background fluxes

2005-07-07

arxiv.org/abs/hep-th/0507069v2

JHEP 0510:102,2005

Physics

High Energy Physics

High Energy Physics - Theory

Fermion coupling to five-form restored, conclusions of the paper unchanged

Scientific paper

10.1088/1126-6708/2005/10/102

We study the problem of instanton generated superpotentials in Calabi-Yau orientifold compactifications directly in type IIB string theory. To this end, we derive the Dirac equation on a Euclidean D3 brane in the presence of background fluxes. We propose an index which governs whether the generation of a superpotential in the effective 4d theory by D3 brane instantons is possible. Applying the formalism to various classes of examples, including the K3 x T^2/Z_2 orientifold, in the absence and presence of fluxes, we show that our results are consistent with conclusions attainable via duality from an M-theory analysis.

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