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The Akbulut cork is not universal

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arxiv 2311.17028 v3 pith:XJKRR3QK submitted 2023-11-28 math.GT

classification math.GT
keywords corkakbulutmanifoldsuniversalboundaryexoticsimply-connectedthere
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abstract

We exhibit infinitely many exotic pairs of simply-connected, closed $4$-manifolds not related by any cork of the infinite family $W_n$ constructed by Akbulut and Yasui whose first member is the Akbulut cork. In particular, the Akbulut cork is not universal. Moreover we show that, in the setting of manifolds with boundary, there are no $\partial$-universal corks, i.e. there does not exist a cork which relates any exotic pair of simply-connected $4$-manifolds with boundary.

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  1. On $h$-cobordisms of complexity $2$

    math.GT 2025-01 conditional novelty 7.0 of 10

    Computes the monopole Floer homology and twisting involution of the complexity-2 protocork boundary, and constructs h-cobordisms of arbitrarily large Morgan-Szabó complexity between exotic pairs of closed 1-connected ...

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