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arXiv 0712.2202math.GTmath.SG
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近辛流形上的褶皱纤维化

Wrinkled fibrations on near-symplectic manifolds

Yanki Lekili

摘要:

受Taubes和Perutz发起的计划的启发,我们研究了近辛4-流形的几何,即,流形配备了一个封闭的2-形式,这是辛的一个联盟以外的嵌入1维子流形,并打破莱夫谢茨纤维化。我们给出了一组四步移动,使我们可以从任意给定的纤维化移动到与之变形等价的任意一个断裂纤维化,并研究了在每一步移动下近辛几何的变化.的参数依赖于引进一个更一般的一类地图,我们称之为皱纹纤维化,并允许我们依赖于经典的奇异theory.Finally,我们说明了这些建设显示如何可以合并零集的近辛形式的组件。我们还反驳了盖伊和柯比的猜想表明,任何非手性破碎的莱夫谢茨纤维化可以变成一个破碎的莱夫谢茨纤维化,通过应用我们的动作序列。

英文摘要:

Motivated by the programmes initiated by Taubes and Perutz, we study the geometry of near-symplectic 4-manifolds, i.e., manifolds equipped with a closed 2-form which is symplectic outside a union of embedded 1-dimensional submanifolds, and broken Lefschetz fibrations on them. We present a set of four moves which allow us to pass from any given fibration to any other broken fibration which is deformation equivalent to it. Moreover, we study the change of the near-symplectic geometry under each of these moves. The arguments rely on the introduction of a more general class of maps, which we call wrinkled fibrations and which allow us to rely on classical singularity theory.Finally, we illustrate these constructions by showing how one can merge components of the zero-set of the near-symplectic form. We also disprove a conjecture of Gay and Kirby by showing that any achiral broken Lefschetz fibration can be turned into a broken Lefschetz fibration by applying a sequence of our moves.

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