On 3-dimensional almost Einstein manifolds with circulant structures

Authors : Iva Dokuzova

Pages : 1484-1497

Doi:10.3906/mat-1904-97

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Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :A 3-dimensional Riemannian manifold equipped with a tensor structure of type 1,1 , whose third power is the identity, is considered. This structure and the metric have circulant matrices with respect to some basis, i.e. these structures are circulant. An associated manifold, whose metric is expressed by both structures, is studied. Three classes of such manifolds are considered. Two of them are determined by special properties of the curvature tensor of the manifold. The third class is composed by manifolds whose structure is parallel with respect to the Levi-Civitaconnection of the metric. Some geometric characteristics of these manifolds are obtained. Examples of such manifolds are given
Keywords : Riemannian manifold, indefinite metric, Einstein manifold, Ricci curvature, Lie group