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arXiv 1909.01030math.AGmath.NT
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加权射影叠加上有理曲线模叠加的动机

Motive of the moduli stack of rational curves on a weighted projective stack

Jun-Yong Park, Hunter Spink

摘要:

证明了次数有理曲线有理曲线模栈在加权射影栈$n$上的紧支撑动机在任意基域$K$和$\text{char}(K) \nmid a,b$上都是混合Tate型的,并且在Grothendieck栈环上有类$\mathbb{L}^{(a+b)n+1}-\mathbb{L}^{(a+b)n-1}$.特别是,这改善了[HP]的结果关于算术不变的模量堆栈$\mathcal{L}_{1,12n} := \mathrm{Hom}_{n}(\mathbb{P}^1, \overline{\mathcal{M}}_{1,1})$的稳定椭圆纤维化在$\mathbb{P}^{1}$与$12n$节点奇异纤维和显着的维尔斯特拉斯部分。

英文摘要:

We show the compactly supported motive of the moduli stack of degree $n$ rational curves on the weighted projective stack $\mathcal{P}(a,b)$ is of mixed Tate type over any base field $K$ with $\text{char}(K) \nmid a,b$ and has class $\mathbb{L}^{(a+b)n+1}-\mathbb{L}^{(a+b)n-1}$ in the Grothendieck ring of stacks. In particular, this improves upon the result of [HP] regarding the arithmetic invariant of the moduli stack $\mathcal{L}_{1,12n} := \mathrm{Hom}_{n}(\mathbb{P}^1, \overline{\mathcal{M}}_{1,1})$ of stable elliptic fibrations over $\mathbb{P}^{1}$ with $12n$ nodal singular fibers and a marked Weierstrass section.

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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