The collapse conjecture for finite simple groups

Let GG be a finite group. Say that GG collapses if every finite-dimensional pointed Hopf algebra HH with group of grouplikes G(H)GG(H)\simeq G is isomorphic to kG\Bbbk G; equivalently, every nonzero Yetter–Drinfeld module VkGkGYDV\in {}^{\Bbbk G}_{\Bbbk G}\mathcal{YD} has infinite-dimensional Nichols algebra B(V)\mathscr B(V). Collapse conjecture. If GG is a non-abelian finite simple group, then GG collapses. This conjecture would provide a guiding principle for the classification of finite-dimensional pointed Hopf algebras over non-abelian finite simple groups; the stated passage presents it as supported by evidence accumulated over the preceding years, without recording a resolution.

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Primary source

Nicolás Andruskiewitsch and Giovanna Carnovale, “Hopf algebras over Chevalley groups”, arXiv:2603.12428 (2026).

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