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arXiv 2101.00482math.AG
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齐次和加权齐次超曲面的欧拉示性数

Euler characteristics of homogeneous and weighted-homogeneous hypersurfaces

Marc Levine, Simon Pepin Lehalleur, Vasudevan Srinivas

摘要:

设$k$是一个域,$\text{GW}(k)$是$k$上虚非退化对称双线性型的Grothendieck-Witt环.我们发展了计算射影空间或加权射影空间中光滑超曲面$X$的二次欧拉示性数$χ(X/k)\in \text{GW}(k)$的方法。我们提出了一个经典导体公式的二次精化的问题,并找到了这样一个公式退化的光滑超曲面$X$在$\mathbb{P}^{n+1}$的锥上的光滑超平面部分的$X$,我们也发现了类似的公式在加权齐次的情况下。我们制定了一个猜想,这些计算推广到类似类型的退化。最后,我们给出了Ayoub附近圈函子的二次导体公式的解释。

英文摘要:

Let $k$ be a field and let $\text{GW}(k)$ be the Grothendieck-Witt ring of virtual non-degenerate symmetric bilinear forms over $k$. We develop methods for computing the quadratic Euler characteristic $χ(X/k)\in \text{GW}(k)$ for $X$ a smooth hypersurface in a projective space or a weighted projective space. We raise the question of a quadratic refinement of classical conductor formulas and find such a formula for the degeneration of a smooth hypersurface $X$ in $\mathbb{P}^{n+1}$ to the cone over a smooth hyperplane section of $X$; we also find a similar formula in the weighted homogeneous case. We formulate a conjecture that generalizes these computations to similar types of degenerations. Finally, we give an interpretation of the quadratic conductor formulas in terms of Ayoub's nearby cycles functor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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