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https://hdl.handle.net/2440/86571
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Type: | Journal article |
Title: | On the geometry of flat pseudo-Riemannian homogeneous spaces |
Author: | Globke, W. |
Citation: | Israel Journal of Mathematics, 2014; 202(1):255-274 |
Publisher: | Springer |
Issue Date: | 2014 |
ISSN: | 0021-2172 1565-8511 |
Statement of Responsibility: | Wolfgang Globke |
Abstract: | Let M = ℝsn/Γ be a complete flat pseudo-Riemannian homogeneous manifold, Γ ⊂ Iso(ℝsn) its fundamental group and G the Zariski closure of Γ in Iso(ℝsn). We show that the G-orbits in ℝsn are affine subspaces and affinely diffeomorphic to G endowed with the (0)-connection. If the restriction of the pseudo-scalar product on ℝsn to the G-orbits is nondegenerate, then M has abelian linear holonomy. If additionally G is not abelian, then G contains a certain subgroup of dimension 6. In particular, for non-abelian G, orbits with non-degenerate metric can appear only if dim G ≥ 6. Moreover, we show that ℝsn is a trivial algebraic principal bundle G → M → ℝn−k. As a consquence, M is a trivial smooth bundle G/Γ → M → ℝn−k with compact fiber G/Γ. |
Rights: | Copyright status unknown |
DOI: | 10.1007/s11856-014-1060-9 |
Published version: | http://dx.doi.org/10.1007/s11856-014-1060-9 |
Appears in Collections: | Aurora harvest 2 Computer Science publications |
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