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arXiv 1801.09013math.AGmath.CO
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亏格为PDMATHAAB且权为$\frac{1}{2}$的Hasett空间上的$ψ$类的交

Intersections of $ψ$ classes on Hassett Spaces for genus $0$ with all weights $\frac{1}{2}$

Nand Sharma

摘要:

Hassett空间是加权稳定点曲线的模空间。在这项工作中,我们考虑这样的空间的曲线亏格$0$的重量都$\frac{1}{2}$。这些空间是有趣的,因为它们同构于$\overline{M}_{0,n}$,但有不同的泛族和不同的相交理论。我们发展了一个闭公式,$ψ$ -类的交集在这样的空间。在我们的主要结果中,我们编码的顶部交叉公式中的生成函数,通过应用微分算子的威腾势。

英文摘要:

Hassett spaces are moduli spaces of weighted stable pointed curves. In this work, we consider such spaces of curves of genus $0$ with weights all $\frac{1}{2}$. These spaces are interesting as they are isomorphic to $\overline{M}_{0,n}$ but have different universal families and different intersection theory. We develop a closed formula for intersections of $ψ$-classes on such spaces. In our main result, we encode the formula for top intersections in a generating function obtained by applying a differential operator to the Witten-potential.

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