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arXiv 2409.07009math.GT
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$b_2^+ = 2$的4-流形上的怪异微分同胚

Exotic diffeomorphisms on $4$-manifolds with $b_2^+ = 2$

Haochen Qiu

AI总结:

针对$b_2^+=2$的4-流形怪异微分同胚研究因参数化规范理论不变量定义不完善而受限的问题,本文通过比较参数族环绕数的方法,证明$2\bC\bP^2\n#10(-\bC\bP^2)$存在怪异微分同胚,是目前已知最小的相关闭4-流形例子。

摘要:

尽管怪异微分同胚的内容十分丰富,但我们对$b^+_2 =2$的情形了解甚少,因为参数化规范理论不变量尚未得到良好定义。本文提出了一种通过比较参数族环绕数的方法,来寻找$b^+_2 =2$的单连通光滑闭4-流形上的怪异微分同胚,并由此得到$2\bC\bP^2 \n# 10 (-\bC\bP^2)$存在怪异微分同胚的结论。这是目前已知的最小的支持怪异微分同胚的闭4-流形例子。

英文摘要:

While the exotic diffeomorphisms turned out to be very rich, we know much less about the $b^+_2 =2$ case, as parameterized gauge-theoretic invariants are not well defined. In this paper we present a method (that is, comparing the winding number of parameter families) to find exotic diffeomorphisms on simply-connected smooth closed $4$-manifolds with $b^+_2 =2$, and as a result we obtain that $2\mathbb{C}\mathbb{P}^2 \# 10 (-{\mathbb{C}\mathbb{P}^2})$ admits exotic diffeomorphisms. This is currently the smallest known example of a closed $4$-manifold that supports exotic diffeomorphisms.

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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