Holonomy Groups of $G_2^*$-Manifolds
MFO Scientific ProgramResearch in Pairs 2016
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We classify the holonomy algebras of manifolds admitting an indecomposable torsion free $G_2^*$-structure, i.e. for which the holonomy representation does not leave invariant any proper non-degenerate subspace. We realize some of these Lie algebras as holonomy algebras of left-invariant metrics on Lie groups.