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arXiv 2202.05375math.AGmath.CV
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具有孤立奇点的超曲面的Jacobian模中的双线性型与$N$ -谱链的结合

Bilinear forms in the Jacobian module and binding of $N$-spectral chains of a hypersurface with an isolated singularity

Miguel Angel Dela-Rosa, Xavier Gómez-Mont

摘要:

用他的深刻和美丽的想法切割与超平面,莱夫谢茨解释了如何同调群的一个投影顺利品种可以建造的基本件,他所谓的原始同源性。这个想法可以应用于任何时候,我们有一个向量空间的biliner形式(即同调杯积)和一个$\pm$ -对称幂零算子幂零算子(即切割超平面)。我们将在奇点理论:由$f=0$定义的超曲面的孤立奇点的胚芽的背景下说明这一点。我们从奇点的雅可比(或米尔诺)代数中的代数设置开始,Grothendieck配对作为双线性形式,乘以$f$作为对称幂零算子。在拓扑上,利用由杯积导出的双线性形式,继续讨论了作为反对称算子的单值映射的幂零映射的对数的消失上同调。然后我们使用Brieskorn(1970),A. Varchenko(1980s),M. Saito(1989)和C. Hertling(1999,2004,2005),在奇点处引入了极化混合霍奇结构(Steenbrink,1976),并将奇点的谱作为比代数单值的特征值更深的不变量。特别地,我们展示了如何从几个$N$ -Jordan链中得到一个$f$-Jordan链,通过将它们粘在Brieskorn晶格中。

英文摘要:

Using his deep and beautiful idea of cutting with a Hyperplane, Lefschetz explained how the homology groups of a projective smooth variety could be constructed from basic pieces, that he called primitive homology. This idea can be applied every time we have a vector space with a biliner form (i.e. homology with cup product) and a $\pm$-symmetric nilpotent operator (i.e. cutting with a hyperplane). We will illustrate this in the context of Singularity Theory: A germ of an isolated singular point of a hypersurface defined by $f=0$. We begin with the algebraic setting in the Jacobian (or Milnor) Algebra of the singularity, with Grothendieck pairing as bilinear form and multiplication by $f$ as a symmetric nilpotent operator. We continue in the topological setting of vanishing cohomology with bilinear form induced from cup product and as nilpotent map the logarithm of the unipotent map of the monodromy as an anti-symmetric operator. We then show how these 2 very different settings are tied up using the Brieskorn lattice as a D-module, on using results of Brieskorn (1970), A. Varchenko (1980s), M. Saito (1989), and C. Hertling (1999, 2004, 2005), inducing a Polarized Mixed Hodge structure at the singularity (Steenbrink, 1976) and bringing the spectrum of the singularity as a deeper invariant than the eigenvalues of the Algebraic Monodromy. In particular, we show how an $f$-Jordan chain is obtained from several $N$-Jordan chains by gluing them in the Brieskorn lattice.

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