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arXiv 2512.03352math.DG
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反自对偶吹胀II

Anti-self-dual blowups II

Vsevolod Shevchishin, Gleb Smirnov

AI总结:

本文研究四维流形中反自对偶调和形式的存在性,通过h-原理构造自对偶调和形式,扩展了之前关于(-1)-球面的结果。

摘要:

设X是一个闭的、定向的四维流形,且b_2^+ ≤ 3,且X中包含一组彼此不相交的嵌入的(-2)-球面。我们证明在X上存在一个黎曼度量,使得每个这些球面的庞加莱对偶由反自对偶的调和形式表示。这扩展了我们之前关于(-1)-球面的结果。主要的新成分是应用Eliashberg的h-原理来处理紧致接触结构,我们利用它来构造具有指定局部行为的四维 orbifold 上的自对偶调和形式。

英文摘要:

Let $X$ be a closed, oriented four-manifold with $b_2^+ \leq 3$, and suppose $X$ contains a collection of pairwise disjoint embedded $(-2)$-spheres. We prove that there is a Riemannian metric on $X$ such that the Poincare dual of each of these spheres is represented by an anti-self-dual harmonic form. This extends our earlier result for $(-1)$-spheres. The main new ingredient is an application of Eliashberg's $h$-principle for overtwisted contact structures, which we use to construct self-dual harmonic forms on four-orbifolds with prescribed local behaviour near the orbifold singular set.

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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