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Closed geodesics in cosmology and discrete group actions on hyperbolic manifolds

机译:暗曲歧管中的宇宙学和离散组动作的封闭测地测量

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Hyperbolic spaces H~n [7] are models of an infinite cosmos with constant negative curvature. Moreover they provide universal covering spaces for compact finite manifolds M of nontrivial topology with the same metric and curvature. The double torus T∪T and the Weber-Seifert manifold are hyperbolic manifolds M covered by H~2, H~3 respectively. Both display closed geodesies with observable effects on the distribution of matter. The preimage and image points under any homotopy g ∈ π(M) when acting on H~n are identified on M. Therefore any closed geodesic corresponds to a homotopy g. It is shown that Ihe closed geodesies on M associated with g can be compared and classified in length and relative direction by orbits under the continuous normalizers N_g, g ∈π (M).
机译:双曲线空间H〜n [7]是具有恒定负曲率的无限宇宙的模型。此外,它们提供了具有相同度量和曲率的紧凑型有限歧管M的通用覆盖空间。双环T∪T和Weber-Seifert歧管是由H〜2,H〜3覆盖的双曲线歧管M.两者都显示出封闭的凸起的地理率,可观察到的物质分布。在在M上识别出在H〜N上作用时的任何同型Gπ(M)下的预测和图像点。因此,任何闭合的测地均对应于同型G.结果表明,通过连续癌症N_G,G∈π(M)下的轨道可以比较和分类与G相关联的M闭合GeodeSies。

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