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arXiv math/0605001math.SGmath.AGmath.GT
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辫子单值线和Lefschetz束的一个倍度公式

A degree doubling formula for braid monodromies and Lefschetz pencils

Denis Auroux, Ludmil Katzarkov

摘要:

每个紧辛4-流形可以被实现为沿着具有尖点和节点奇点的辛曲线分支的复射影平面的分支覆盖;覆叠映射由“非常充裕”线丛的截面的三元组诱导。本文给出了一个描述线性系(从一个非常充分的丛$L^k$到$L^{2k}$)倍度时分支曲线的辫单值不变量的行为的显式公式.作为结果,我们得到了类似的度加倍公式的映射类群monodromy的唐纳森的辛Lefschetz铅笔。

英文摘要:

Every compact symplectic 4-manifold can be realized as a branched cover of the complex projective plane branched along a symplectic curve with cusp and node singularities; the covering map is induced by a triple of sections of a "very ample" line bundle. In this paper, we give an explicit formula describing the behavior of the braid monodromy invariants of the branch curve upon degree doubling of the linear system (from a very ample bundle $L^k$ to $L^{2k}$). As a consequence, we derive a similar degree doubling formula for the mapping class group monodromy of Donaldson's symplectic Lefschetz pencils.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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