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An eight-dimensional approach to \(G_2\) manifolds. (English) Zbl 0995.83060

Summary: We develop a systematic approach to \(G_2\) holonomy manifolds with an \(\text{SU}(2)\times\text{SU}(2)\) isometry using maximal eight-dimensional gauged supergravity to describe D6-branes wrapped on deformed three-spheres. A quite general metric ansatz that generalizes the celebrated Bryant-Salamon metric involves nine functions. We show that only six of them are independent ones and derive the general first order system of differential equations that they obey. As a byproduct of our analysis, we generalize the notion of the twist that relates the spin and gauge connections in a way that involves non-trivially the scalar fields.

MSC:

83E30 String and superstring theories in gravitational theory

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