Homogeneous nearly Kähler manifolds

Details Homogeneous nearly Kähler manifolds Homogeneous nearly Kähler manifolds

2010-06-14

arxiv.org/abs/1006.2636v2

Mathematics

Differential Geometry

42 pages

Scientific paper

The structure of nearly K\"ahler manifolds was studied by Gray in several papers. More recently, a relevant progress on the subject has been done by Nagy. Among other results, he proved that a strict and complete nearly K\"ahler manifold is locally a Riemannian product of homogeneous nearly K\"ahler spaces, twistor spaces over quaternionic K{\"ahler manifolds and six-dimensional nearly K\"ahler manifolds, where the homogeneous nearly K\"ahler factors are also 3-symmetric spaces. In the present paper, using the lists of $3$-symmetric spaces given by Wolf & Gray, we display the exhaustive list of irreducible simply connected homogeneous strict nearly K\"ahler manifolds. For such manifolds, we give details relative to the intrinsic torsion and the Riemannian curvature. Additionally, we determine the canonical fibration for those with special algebraic torsion.

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