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Title: On types of non-integrable geometrie (English)
Author: Friedrich, Thomas
Language: English
Journal: Proceedings of the 22nd Winter School "Geometry and Physics"
Issue: 2002
Pages: [99]-113
Category: math
Summary: A G-structure on a Riemannian manifold is said to be integrable if it is preserved by the Levi-Civita connection. In the presented paper, the following non-integrable G-structures are studied: SO(3)-structures in dimension 5; almost complex structures in dimension 6; G$_2$-structures in dimension 7; Spin(7)-structures in dimension 8; Spin(9)-structures in dimension 16 and F$_4$-structures in dimension 26. G-structures admitting an affine connection with totally skew-symmetric torsion are characterized. It is known [{\it S. Ivanov}, {Connections with torsion, parallel spinors and geometry of {Spin(7)}-manifolds}, math.dg/0111216] that any Spin(7)-structure admits a unique connection with totally skew-symmetric torsion. In this paper, it is proved that under weak conditions on the structure group this is the only geometric structure with that property. Moreover, the automorphisms group of non-integrable geometric structures are studied. (English)
MSC: 53C05
MSC: 53C10
MSC: 53C27
idZBL: Zbl 1079.53041
idMR: MR1982437
Date available: 2009-07-13T21:49:01Z
Last updated: 2012-09-18
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