The stable Carlsson conjecture for manifolds

From papers

Let MM be a closed connected manifold, and let rankp(M)\operatorname{rank}_p(M) denote the largest integer rr such that (Z/p)r(\mathbb{Z}/p)^r acts freely on MM.

Stable Carlsson conjecture. There exists a constant CC such that, for every prime p>Cp>C,

dimH(M,Z/p)2rankp(M).\dim H^*(M,\mathbb{Z}/p)\geq 2^{\operatorname{rank}_p(M)}.

This is a weaker, stable version of Carlsson's conjecture: the asserted bound is required only for primes larger than a constant depending on MM. The source does not specify whether it is open or resolved.

Progress summary

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Sources & referencesView supporting material

Primary source

Jordi Daura Serrano, “Large and iterated finite group actions on manifolds admitting non-zero degree maps to nilmanifolds”, arXiv:2506.11174 (2025).

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