非正特征下的子度量及其应用
Submetries in non-positive signature and applications
AI总结:
研究非正特征下子度量概念的推广,通过完备性假设建立光滑时空间洛伦兹子度量与局部\(C^{1,1}\)半黎曼淹没的对应关系,并得出相关应用。
AI中文摘要:
我们考虑为时空设置量身定制的子度量概念的推广。表明在适当的完备性假设下,光滑时空之间的洛伦兹子度量对应于局部\(C^{1,1}\)半黎曼淹没。此外,还建立了关于类时曲率界、等距群作用、非因果叶状结构和洛伦兹 - 瓦瑟斯坦几何的一些应用。
英文摘要:
We consider a generalization of the notion of submetry tailored to the setting of spacetimes. We show that, under suitable completeness assumptions, Lorentzian submetries between smooth spacetimes correspond to locally C^{1,1} Semi-Riemannian submersions. Moreover, we establish some applications regarding timelike curvature bounds, isometric group actions, acausal foliations and Lorentz-Wasserstein geometry.