The stable Carlsson conjecture for manifolds

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Let MM be a closed connected manifold, and let rank⁡p(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,

dim⁡H∗(M,Z/p)≥2rank⁡p(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.

References

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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