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arxiv: 1005.0172 · v2 · pith:EJB75VJYnew · submitted 2010-05-02 · 🧮 math.DG · math.GR

Homogeneous Hypercomplex Structures I - the compact Lie groups

classification 🧮 math.DG math.GR
keywords compactgroupshypercomplexstemstructuresabovealgebraapply
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We introduce a remarkable subset "the stem" of the set of positive roots of a reduced root system. The stem determines several interesting decompositions of the corresponding reductive Lie algebra. It gives also a nice simple three dimensional subalgebra and a "Cayley transform". In the present paper we apply the above devices to give a complete classification of invariant hypercomplex structures on compact Lie groups.

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  1. On homogeneous HKT manifolds and the Einstein condition

    math.DG 2026-04 unverdicted novelty 6.0

    Every homogeneous hypercomplex manifold with transitive compact Lie group action admits a unique invariant HKT-Einstein metric up to scaling, and invariant strong HKT metrics have Bismut-parallel torsion and curvature.