An eight-dimensional approach to G_2 manifolds
arXiv:hep-th/0202135 · doi:10.1016/S0370-2693(02)01862-2
Abstract
We develop a systematic approach to G_2 holonomy manifolds with an SU(2)xSU(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 the 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.
16 pages, Latex. v2: Minor and cosmetic changes, and references added. Journal version
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