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WDVV-type relations for Welschinger invariants: Applications

机译:Welschinger 不变量的 WDVV 类型关系:应用

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摘要

We first recall Solomon's relations for Welschinger invariants counting real curves in real symplectic fourfolds and the Witten-Dijkgraaf-Verlinde-Verlinde (WDVV)-style relations for Welschinger invariants counting real curves in real symplectic sixfolds with some symmetry. We then explicitly demonstrate that, in some important cases (projective spaces with standard conjugations, real blowups of the projective plane, and two- and threefold products of the one-dimensional projective space with two involutions each), these relations provide complete recursions determining all Welschinger invariants from basic input. We include extensive tables of Welschinger invariants in low degrees obtained from these recursions with Mathematica. These invariants provide lower bounds for counts of real rational curves, including with curve insertions in smooth algebraic threefolds.
机译:我们首先回顾一下所罗门的 Welschinger 不变量关系,在实辛四重中计算实曲线,以及 Witten-Dijkgraaf-Verlinde-Verlinde (WDVV) 式关系,在具有一定对称性的实辛六重中计算实曲线。然后,我们明确地证明,在一些重要情况下(具有标准共轭的射影空间、射影平面的实际爆炸以及一维射影空间的二倍和三倍乘积,每个射影空间具有两个卷积),这些关系提供了完全递归,从基本输入确定所有 Welschinger 不变量。我们包括了大量使用 Mathematica 从这些递归中获得的低阶 Welschinger 不变量表。这些不变量为实有理曲线的计数提供了下限,包括在光滑代数三重中插入曲线。

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