Connexions with totally skew-symmetric torsion and nearly-Kaehler geometry

Details Connexions with totally skew-symmetric torsion and nearly-Kaehler geometry Connexions with totally skew-symmetric torsion and nearly-Kaehler geometry

2007-09-08

arxiv.org/abs/0709.1231v1

Mathematics

Differential Geometry

45 pages

Scientific paper

We study almost Hermitian structures admitting a Hermitian connexion with totally skew-symmetric torsion or equivalently, those almost Hermitian structures with totally skew-symmetric Nijenhuis tensor. We investigate up to what extent the Nijenhuis tensor fails to be parallel with respect to the characteristic connexion. This is naturally described by means of an extension of the notion of Killing form to almost Hermitian geometry. In this context, we also make an essentially self-contained survey of nearly-Kaehler geometry, but from the perspective of non-integrable holonomy systems.

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