arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.07416gr-qcmath.AP
收藏

渐近Anti-de Sitter时空中波的改进唯一延拓和测地线

Null Geodesics and Improved Unique Continuation for Waves in Asymptotically Anti-de Sitter Spacetimes

Alex McGill, Arick Shao

摘要:

我们考虑的问题,是否解决的Klein-Gordon方程的渐近Anti-de Sitter时空可以唯一连续的共形边界。第二作者与G. Holzegel,在适当的假设下的边界几何形状和边界数据施加在一个足够长的时间跨度。关键的一步是建立Carleman估计Klein-Gordon算子附近的共形边界。本文进一步改进了上述结果。首先,我们建立新的Carleman估计-因此新的独特的延续结果-克莱因-戈登方程的一个更大的类的时空,特别是更一般的边界几何。其次,我们认为,在许多方面,我们的假设,将它们连接到零测地线的轨迹附近的共形边界的最优性,这些测地线发挥了至关重要的作用,在建设的反例,以独特的延续。最后,我们开发了一个新的协变形式主义,这将是有用的-目前和更普遍的超越这篇文章-治疗张量对象的渐近极限在共形边界。

英文摘要:

We consider the question of whether solutions of Klein--Gordon equations on asymptotically Anti-de Sitter spacetimes can be uniquely continued from the conformal boundary. Positive answers were first given by the second author with G. Holzegel, under suitable assumptions on the boundary geometry and with boundary data imposed over a sufficiently long timespan. The key step was to establish Carleman estimates for Klein--Gordon operators near the conformal boundary. In this article, we further improve upon the above-mentioned results. First, we establish new Carleman estimates---and hence new unique continuation results---for Klein--Gordon equations on a larger class of spacetimes, in particular with more general boundary geometries. Second, we argue for the optimality, in many respects, of our assumptions by connecting them to trajectories of null geodesics near the conformal boundary; these geodesics play a crucial role in the construction of counterexamples to unique continuation. Finally, we develop a new covariant formalism that will be useful---both presently and more generally beyond this article---for treating tensorial objects with asymptotic limits at the conformal boundary.

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。

↑