Virtual push-forwards

Virtual push-forwards
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虚拟前推

DOI:
10.2140/gt.2012.16.2003
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发表时间:
2010
影响因子:
2
通讯作者:
C. Manolache
C. Manolache
中科院分区:
数学1区
文献类型:
--
作者:
C. Manolache

文献摘要

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设$p:F\to G$是相对维度为$k$的正\emph{虚拟}堆叠的态射,并设H^k(F)$中的$\Gamma\.我们给出了$p_*\Gamma\CDOT[F]^{virt}$是$[G]^{virt}$的倍数的充分条件。我们将这一结果应用到几乎光滑族的数目守恒的类比中。我们给出了Gromov-Witten不变量的含义,并给出了Marian,Oprea和Pandharipande的一个定理的新证明,该定理比较了稳定映射模空间和稳定商模空间的虚类。
Let $p:F\to G$ be a morphism of stacks of positive \emph{virtual} relative dimension $k$ and let $\gamma\in H^k(F)$. We give sufficient conditions for $p_*\gamma\cdot[F]^{virt}$ to be a multiple of $[G]^{virt}$. We apply this result to show an analogue of the conservation of number for virtually smooth families. We show implications to Gromov-Witten invariants and give a new proof of a theorem of Marian, Oprea and Pandharipande which compares the virtual classes of moduli spaces of stable maps and moduli spaces of stable quotients.