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Published online by Cambridge University Press: 12 August 2025
We study the geometry induced on the local orbit spaces of Killing vector fields on (Riemannian) $G$-manifolds, with an emphasis on the cases
$G=\textrm {Spin}(7)$ and
$G=G_2$. Along the way, we classify the harmonic morphisms with one-dimensional fibres from
$G_2$-manifolds to Einstein manifolds.