A Lefschetz-type Theorem for Quasimap Invariants via Relative Quasimaps
A Lefschetz-type Theorem for Quasimap Invariants via Relative Quasimaps
复制标题
基于相对拟图的拟图不变量的 Lefschetz 型定理
DOI:
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发表时间:
2017
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通讯作者:
Navid Nabijou
中科院分区:
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作者:
L. Battistella;Navid Nabijou
We define moduli spaces of relative toric quasimaps in genus zero, in the spirit of A. Gathmann. When $X$ is a smooth toric variety and $Y$ is a very ample hypersurface in $X$ we construct a virtual class on the moduli space of relative quasimaps to $(X,Y)$ which can be used to define relative quasimap invariants of the pair. We obtain a recursion formula which expresses each relative invariant in terms of invariants of lower multiplicity. Finally we apply this formula to derive a Lefschetz-type theorem expressing the restricted quasimap invariants of $Y$ in terms of those of $X$. We include several appendices collecting proofs of standard results in quasimap theory.