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arXiv 2007.10314math.SGmath-phmath.DGmath.DSmath.MP
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奇异辛流形上的可积系统:从局部到全局

Integrable systems on singular symplectic manifolds: From local to global

Robert Cardona, Eva Miranda

AI总结:

本文研究一阶奇异辛流形上的可积系统,证明了折叠辛可积系统的作用-角定理,给出两类奇异辛结构下可积系统的全局构造并发现源于临界集拓扑的全局作用-角坐标存在障碍。

摘要:

本文研究配备一阶奇异辛结构的流形上的可积系统。这类结构在一张超曲面之外是辛的,在该超曲面上辛体积以横截方式趋于无穷或零(一阶奇点),分别对应$b$-辛形式或折叠辛形式,形式发生退化的超曲面称为临界集。本文为[KM]和[KMS]中开启的这类结构的作用-角坐标存在性研究提供了新推进,证明了折叠辛可积系统的作用-角定理。与预期不同的是,折叠辛流形的作用-角坐标定理无法像[KM]中对辛形式和$b$-辛形式的处理那样表示为余切提升。本文给出了两类情形下可积系统的全局构造,并研究了作用-角坐标全局存在性的障碍。新发现的拓扑障碍源于奇异辛流形临界集$Z$的拓扑,而这些障碍的存在反过来意味着$Z$上的可积系统存在奇点。

英文摘要:

In this article we consider integrable systems on manifolds endowed with singular symplectic structures of order one. These structures are symplectic away from an hypersurface where the symplectic volume goes either to infinity or to zero in a transversal way (singularity of order one) resulting either in a $b$-symplectic form or a folded symplectic form. The hypersurface where the form degenerates is called critical set. We give a new impulse to the investigation of the existence of action-angle coordinates for these structures initiated in [KM] and [KMS] by proving an action-angle theorem for folded symplectic integrable systems. Contrary to expectations, the action-angle coordinate theorem for folded symplectic manifolds cannot be presented as a cotangent lift as done for symplectic and $b$-symplectic forms in [KM]. Global constructions of integrable systems are provided and obstructions for global existence of action-angle coordinates are investigated in both scenarios. The new topological obstructions found emanate from the topology of the critical set $Z$ of the singular symplectic manifold. The existence of these obstructions in turn implies the existence of singularities for the integrable system on $Z$.

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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