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arXiv 0707.2986math.AG
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全纯2-形式簇的Gromov-Witten不变量

Gromov-Witten invariants of varieties with holomorphic 2-forms

Young-Hoon Kiem, Jun Li

摘要:

我们证明了光滑代数簇X上的全纯二形式$θ$将稳定映射$\mgn(X,β)$的模的虚基本类局部化到$θ$退化的轨迹上;然后使我们能够定义局部GW-不变量,这是辛几何中Lee和Parker的局部不变量的代数几何模拟,当X是适当的时,它与普通GW-不变量相一致。它是变形不变的。在此基础上,我们证明了Maulik和Pandharipande所建立的p_g>0的极小一般型曲面的低次GW-不变量的公式.

英文摘要:

We show that a holomorphic two-form $θ$ on a smooth algebraic variety X localizes the virtual fundamental class of the moduli of stable maps $\mgn(X,β)$ to the locus where $θ$ degenerates; it then enables us to define the localized GW-invariant, an algebro-geometric analogue of the local invariant of Lee and Parker in symplectic geometry, which coincides with the ordinary GW-invariant when X is proper. It is deformation invariant. Using this, we prove formulas for low degree GW-invariants of minimal general type surfaces with p_g>0 conjectured by Maulik and Pandharipande.

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