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arXiv 2507.02482math.DS
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测地流中通过Lyapunov指数水平集的曲率刚性

Curvature Rigidity Through Level Sets of Lyapunov Exponents in Geodesic Flows

Sergio Romaña

AI总结:

本文通过不变测度研究Lyapunov指数水平集,证明零Lyapunov指数水平集全测度蕴含流形平坦、水平集全测度蕴含截面曲率常数,并给出无共轭点流形上阻碍光滑共轭的新判据,统一证明了已有刚性结果。

摘要:

本文通过不变测度研究Lyapunov指数水平集,建立了新的几何刚性结果。首先,我们证明对于无焦点流形$M$,如果零Lyapunov指数水平集关于某个全支撑不变测度具有全测度,则$M$必为平坦流形。该结果恢复并推广了Freire和Mañé的结果(参见[9])。其次,我们证明如果Lyapunov指数的水平集关于某个全支撑测度具有全测度,则截面曲率必为常数。这推进了[17]中猜想1的解决。此外,我们建立了具有$1$-等价测地流的流形之间的曲率关系,为无共轭点流形上的流的光滑共轭性提供了一个新的阻碍判据。我们的方法为[17]中所有刚性结果提供了统一证明,并作为推论在无共轭点情形下额外得到了全测地子流形的刚性定理。值得注意的是,若干关键结果在无紧性假设下仍然成立。

英文摘要:

In this paper, we establish new geometric rigidity results through the study of Lyapunov exponent level sets via invariant measures. First, we prove that for a manifold $M$ without focal points, if the zero Lyapunov exponent level set has full measure with respect to a fully supported invariant measure, then $M$ must be flat. This result recovers and extends a result of Freire and Mañé (cf. [9]). Second, we prove that if the level set of the Lyapunov exponents has full measure with respect to some fully supported measure, then the sectional curvature must be constant. This advances the resolution of Conjecture 1 in [17]. Furthermore, we establish curvature relationships between manifolds with $1$-equivalent geodesic flows, yielding a new criterion to obstruct smooth conjugacy for flows on manifolds without conjugate points. Our techniques provide unified proofs for all rigidity results in [17] as corollaries, and additionally yield rigidity theorems for totally geodesic submanifolds in settings without conjugate points. Notably, several key results hold without compactness assumptions.

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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