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arXiv 0903.0700math.SGmath.DS
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Mañé临界值的辛拓扑

Symplectic topology of Mañé's critical values

K. Cieliebak, U. Frauenfelder, G. P. Paternain

摘要:

研究了扭余切丛上力学哈密顿量的能量超曲面的动力学和辛拓扑。我们特别注意周期轨道、可解性、稳定性和接触型性质,以及在Mane临界值c处发生的变化。我们的主要工具是Rabinowitz弗洛尔同调。我们证明了它是定义为超曲面,无论是稳定驯服或虚拟接触,它是不变的下同伦在这些类。如果位形空间允许一个负曲率的度量,那么Rabinowitz弗洛尔同调对能级k>c不为零,因此,这些能级集是不可置换的。我们提供了一大类例子,其中Rabinowitz弗洛尔同调对于能级k>c是非零的,但对于k<c为零,因此高于和低于c的能级不能由稳定的驯服同伦连接。此外,我们表明,严格的1/4箍缩负曲率和非精确磁场的所有足够高的能级是不稳定的,提供的基础流形的尺寸是均匀的,并不同于2。

英文摘要:

We study the dynamics and symplectic topology of energy hypersurfaces of mechanical Hamiltonians on twisted cotangent bundles. We pay particular attention to periodic orbits, displaceability, stability and the contact type property, and the changes that occur at the Mane critical value c. Our main tool is Rabinowitz Floer homology. We show that it is defined for hypersurfaces that are either stable tame or virtually contact, and it is invariant under under homotopies in these classes. If the configuration space admits a metric of negative curvature, then Rabinowitz Floer homology does not vanish for energy levels k>c and, as a consequence, these level sets are not displaceable. We provide a large class of examples in which Rabinowitz Floer homology is non-zero for energy levels k>c but vanishes for k<c, so levels above and below c cannot be connected by a stable tame homotopy. Moreover, we show that for strictly 1/4-pinched negative curvature and non-exact magnetic fields all sufficiently high energy levels are non-stable, provided that the dimension of the base manifold is even and different from two.

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