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arXiv 1307.7239math.SG
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广义Conley-Zehnder指数

Generalized Conley-Zehnder index

Jean Gutt

摘要:

Conley-Zehnder指数将整数与辛矩阵的任何连续路径相关联,所述辛矩阵从单位元开始并且结束于不允许1作为特征值的矩阵。我们给出了新的方法来计算这个指数。Robbin和Salamon为辛矩阵的任何连续路径定义了Conley-Zehnder指数的推广;这个推广是半整数值的。它是基于一个马斯洛夫型指数,他们定义了一个连续路径的拉格朗日在辛向量空间$(W,\barΩ)$,选择了一个给定的参考拉格朗日$V$。$(\R^{2n},Ω_0)$的辛自同态的路径被看作是由它们在$(W=\R^{2n}\oplus \R^{2n},\barΩ=Ω_0\oplus -Ω_0)$中的图所定义的拉格朗日量的路径,并且参考拉格朗日量是对角线。Robbin和Salamon给出了这种广义Conley-Zehnder指数的性质,并给出了当路径只有正则交叉时的一个显式公式。我们在这里给出了一个公理化的特征,这个广义的Conley-Zehnder指数。对于辛矩阵的任何连续路径,我们也给出了一个显式的计算方法。

英文摘要:

The Conley-Zehnder index associates an integer to any continuous path of symplectic matrices starting from the identity and ending at a matrix which does not admit 1 as an eigenvalue. We give new ways to compute this index. Robbin and Salamon define a generalization of the Conley-Zehnder index for any continuous path of symplectic matrices; this generalization is half integer valued. It is based on a Maslov-type index that they define for a continuous path of Lagrangians in a symplectic vector space $(W,\barΩ)$, having chosen a given reference Lagrangian $V$. Paths of symplectic endomorphisms of $(\R^{2n},Ω_0)$ are viewed as paths of Lagrangians defined by their graphs in $(W=\R^{2n}\oplus \R^{2n},\barΩ=Ω_0\oplus -Ω_0)$ and the reference Lagrangian is the diagonal. Robbin and Salamon give properties of this generalized Conley-Zehnder index and an explicit formula when the path has only regular crossings. We give here an axiomatic characterization of this generalized Conley-Zehnder index. We also give an explicit way to compute it for any continuous path of symplectic matrices.

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