English

Highly connected non-formal Milnor fibers via polyhedral products

Algebraic Topology 2026-05-12 v1 Algebraic Geometry Combinatorics

Abstract

We show that the realization theorem of Fern\'andez de Bobadilla, which identifies the Milnor fiber of a weighted-homogeneous polynomial with the complement of a germ of analytic set, can be combined with the systematic Massey product constructions of Grbi\'c-Linton for moment-angle complexes ZK=ZK(D2,S1)\mathcal{Z}_K = \mathcal{Z}_K(D^2, S^1) to produce weighted-homogeneous polynomials whose Milnor fibers are arbitrarily highly connected and non-formal. The original application of this strategy, due to Fern\'andez de Bobadilla, used the Denham-Suciu classification of lowest-degree triple Massey products and yielded only 22-connected non-formal Milnor fibers. The Grbi\'c-Linton framework, which constructs non-trivial nn-fold Massey products in H(ZK;Z)H^*(\mathcal{Z}_K;\mathbb{Z}) for arbitrary nn and in arbitrary cohomological degrees, removes this connectivity restriction entirely.

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Cite

@article{arxiv.2605.09254,
  title  = {Highly connected non-formal Milnor fibers via polyhedral products},
  author = {Alexander I. Suciu},
  journal= {arXiv preprint arXiv:2605.09254},
  year   = {2026}
}

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17 pages