Reduction of Homogeneous Riemannian Structures

Details Reduction of Homogeneous Riemannian Structures Reduction of Homogeneous Riemannian Structures

2011-10-28

arxiv.org/abs/1110.6335v1

Mathematics

Differential Geometry

Scientific paper

The goal of this article is the study of homogeneous Riemannian structure tensors within the framework of reduction under a group $H$ of isometries. In a first result, $H$ is a normal subgroup of the group of symmetries associated to the reducing tensor $\bar{S}$. The situation when $H$ is any group acting freely is analyzed in a second result. The invariant classes of homogeneous tensors are also investigated when reduction is performed. It turns out that the geometry of the fibres is involved in the preservation of some of them. Some classical examples illustrate the theory. Finally, the reduction procedure is applied to fiberings of almost contact manifolds over almost Hermitian manifolds. If the structure is moreover Sasakian, the obtained reduced tensor is homogeneous K\"ahler.

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