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arXiv math/9905105math.SGmath.DG
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Hofer-Zehnder容量与Hynn范数下的长度最小化路

Hofer-Zehnder capacity and length minimizing paths in the Hofer norm

Jennifer Slimowitz

摘要:

我们使用Lalonde和McDuff的准则来确定一类新的长度最小化路径的例子在组$Ham(M)$。对于2维或4维的紧致辛流形$M$,我们证明了$Ham(M)$中的一条路径是同伦路径中的长度最小化的,该路径由一个自治的Hamilton算子生成,从恒等式开始,在$M$中不诱导点的非常数闭轨线.在证明的主要步骤涉及到确定一个上界的霍弗-曾德尔能力的辛流形类型$(M \times D(a))$其中$M$是紧凑的,并有二维或四维。在附录中,我们给出了Polterovich的结果的另一种证明,即$CP^2$中的旋转和$CP^2$在一点处的爆破是关于H范数的长度最小化路径。这里我们使用Gromov容量并描述必要的球嵌入。

英文摘要:

We use the criteria of Lalonde and McDuff to determine a new class of examples of length minimizing paths in the group $Ham(M)$. For a compact symplectic manifold $M$ of dimension two or four, we show that a path in $Ham(M)$, generated by an autonomous Hamiltonian and starting at the identity, which induces no non-constant closed trajectories of points in $M$, is length minimizing among homotopic paths. The major step in the proof involves determining an upper bound for the Hofer-Zehnder capacity for symplectic manifolds of the type $(M \times D(a))$ where $M$ is compact and has dimension two or four. In the appendix, we give an alternate proof of Polterovich's result that rotation in $CP^2$ and in the blow-up of $CP^2$ at one point is a length minimizing path with respect to the Hofer norm. Here we use the Gromov capacity and describe the necessary ball embeddings.

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