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arXiv 2603.06458math.MG
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时序方向空间与曲率界

Space of Timelike Directions and Curvature Bounds

Joe Barton, Jona Röhrig

AI总结:

研究时序截面曲率界对方向空间存在性及结构的影响,扩展比较几何框架至洛伦兹设定,提供因果约束下的测地线和曲率合成描述。

摘要:

我们研究了洛伦兹度量空间中时序截面曲率界对一点方向空间存在性和结构的影响。证明在上界时序截面曲率界下,方向空间存在并且本身是一个曲率上界为-1的度量空间。此外,通过引入ε-μ时序截面曲率界概念,展示了方向空间的度量锥,其自然建模给定点的切空间,构成一个时序度量空间,其时序截面曲率上界为0。这些结果将比较几何框架扩展到洛伦兹设定,提供了在因果约束下的测地线、切锥和曲率的合成刻画。

英文摘要:

We investigate the consequences of timelike sectional curvature bounds in Lorentzian length spaces for the existence and structure of the space of directions at a point. It is established that, under upper timelike sectional curvature bounds, the space of directions exists and is itself a metric space with curvature bounded above by $-1$. Furthermore, the metric cone over the space of directions, which canonically models the tangent space at a given point, is shown to constitute a Lorentzian length space with timelike sectional curvature bounded above by $0$. To do this, we introduce the notion of $ε$-$μ$ timelike sectional curvature bounds, which are compatible with pre-existing synthetic curvature conditions. These results extend the comparison-geometric framework to the Lorentzian setting, providing a synthetic characterization of geodesics, tangent cones, and curvature under causal constraints.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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