Mathematics – Differential Geometry
Scientific paper
2010-06-28
Mathematics
Differential Geometry
16 pages
Scientific paper
Let M be a 7-manifold with a G2-structure defined by \phi \in\Omega^{3}_{+}(M). We prove that {\phi} is conformal-Killing with respect to the associated metric g(\phi) if and only if the G2-structure is nearly parallel. Let M be an 8-manifold with a Spin7-structure defined by \psi \in\Omega^{4}_{+}(M). We prove that {\psi} is conformal-Killing with respect to the associated metric g(\psi) if and only if the Spin7-structure is parallel.
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