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arXiv 1901.04734math.GT
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由三分图得到的4-流形的挠率和交形式

Torsions and intersection forms of 4-manifolds from trisection diagrams

Vincent Florens, Delphine Moussard

摘要:

Gay和Kirby引入了三分性,它描述了任何封闭的光滑四维流形$X$作为三个四维流形的并集。一个三分编码在一个图表,即三个集合的曲线在一个封闭的定向表面$Σ$,指导胶合的身体。任何从$π_1(X)$到一个自由阿尔贝群的态射$φ$都诱导出$π_1(Σ)$上的态射。我们用$(Σ;φ)$的第一同调和由曲线集合生成的三个子空间来表示$(X;φ)$的扭同调和Reidemeister挠。我们还用$(Σ;φ)$的交集形式来表达$(X;φ)$的交集形式。

英文摘要:

Gay and Kirby introduced trisections which describe any closed oriented smooth 4-manifold $X$ as a union of three four-dimensional handlebodies. A trisection is encoded in a diagram, namely three collections of curves in a closed oriented surface $Σ$, guiding the gluing of the handlebodies. Any morphism $φ$ from $π_1(X)$ to a finitely generated free abelian group induces a morphism on $π_1(Σ)$. We express the twisted homology and Reidemeister torsion of $(X;φ)$ in terms of the first homology of $(Σ;φ)$ and the three subspaces generated by the collections of curves. We also express the intersection form of $(X;φ)$ in terms of the intersection form of $(Σ;φ)$.

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