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We consider G-equivariant dimensional reduction of Yang-Mills theory withtorsion on manifolds of the form MxG/H where M is a smooth manifold, and G/H isa compact six-dimensional homogeneous space provided with a never integrablealmost complex structure and a family of SU(3)-structures which includes anearly Kahler structure. We establish an equivalence between G-equivariantpseudo-holomorphic vector bundles on MxG/H and new quiver bundles on Massociated to the double of a quiver Q, determined by the SU(3)-structure, withrelations ensuring the absence of oriented cycles in Q. When M=R^2, we describean equivalence between G-invariant solutions of Spin(7)-instanton equations onMxG/H and solutions of new quiver vortex equations on M. It is shown thatgeneric invariant Spin(7)-instanton configurations correspond to quivers Q thatcontain non-trivial oriented cycles.

Double quiver gauge theory and nearly Kahler flux compactifications