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arXiv 1906.01264math.AG
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垂直Vafa-Witten不变量

Vertical Vafa-Witten invariants

Pieter Ties Allerd Laarakker

摘要:

我们发现,\emph{vertical}的贡献(可能是半稳定的)Tanaka托马斯-Vafa-威滕不变量是很好地定义为表面与$p_g(S)>0$,部分证明的结构\cite{TT2}和\cite{T}。此外,我们表明,这样的贡献是由相同的重言式积分计算的稳定的情况下,我们在\cite{L}研究。利用Kiem和Li的工作,我们证明了垂直Joyce-Song偶的泛族的稳定性是由该类族的障碍层的余截面所控制的.

英文摘要:

We show that \emph{vertical} contributions to (possibly semistable) Tanaka-Thomas-Vafa-Witten invariants are well defined for surfaces with $p_g(S)>0$, partially proving conjectures of \cite{TT2} and \cite{T}. Moreover, we show that such contributions are computed by the same tautological integrals as in the stable case, which we studied in \cite{L}. Using the work of Kiem and Li, we show that stability of universal families of vertical Joyce-Song pairs is controlled by cosections of the obstruction sheaves of such families.

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