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arXiv 1608.07541math.SGmath.AG
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Floer上同调、重数与对数典范阈值

Floer Cohomology, Multiplicity and the Log Canonical Threshold

Mark McLean

摘要:

设f是复数上的多项式,在0处有一个孤立奇点。我们表明,多重性和对数典范阈值的f在0是不变量的链接的f视为一个接触子流形的领域。首先构造一个谱序列,它收敛于Milnor单值映射的任何一个图的不动点Floer上同调,该图的E^1页用f的对数分辨率来明确描述。这个谱序列是A'Campo公式的推广。通过观察这个谱序列,我们得到了f的重数和对数正则阈值的纯粹Floer理论描述。

英文摘要:

Let f be a polynomial over the complex numbers with an isolated singularity at 0. We show that the multiplicity and the log canonical threshold of f at 0 are invariants of the link of f viewed as a contact submanifold of the sphere. This is done by first constructing a spectral sequence converging to the fixed point Floer cohomology of any iterate of the Milnor monodromy map whose E^1 page is explicitly described in terms of a log resolution of f. This spectral sequence is a generalization of a formula by A'Campo. By looking at this spectral sequence, we get a purely Floer theoretic description of the multiplicity and log canonical threshold of f.

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