Journal Fü R Die Reine Und Angewandte Mathematik Irreducible Soð3þ Geometry in Dimension Five
Journal Fü R Die Reine Und Angewandte Mathematik Irreducible Soð3þ Geometry in Dimension Five
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发表时间:
2007
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通讯作者:
Walter De;Gruyter Berlin;Marcin Bobien´ski;Paweł Nurowski At Warszawa
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作者:
Walter De;Gruyter Berlin;Marcin Bobien´ski;Paweł Nurowski At Warszawa
We consider the nonstandard inclusion of SOð3Þ in SOð5Þ associated with a 5-dimensional irreducible representation. The tensor 1 representing this reduction is found to be given by a ternary symmetric form with special properties. A 5-dimensional manifold ðM; g; 1Þ with Riemannian metric g and ternary form generated by such a tensor has a corresponding SOð3Þ structure, whose Gray-Hervella type classification is established using soð3Þ-valued connections with torsion. Structures with antisymmetric torsions, we call them the nearly integrable SOð3Þ structures, are studied in detail. In particular, it is shown that the integrable models (those with vanishing torsion) are isometric to the symmetric spaces M þ ¼ SUð3Þ=SOð3Þ, M À ¼ SLð3; RÞ=SOð3Þ, M 0 ¼ R 5. We also find all nearly integrable SOð3Þ structures with transitive symmetry groups of dimension d > 5 and some examples for which d ¼ 5.