Chromatic redshift conjecture for complex and quaternionic Mahowald invariants

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Let YY be a type nn finite complex with a vnv_n-periodic self-map vv, and let dKd_{\mathbb{K}} denote the relevant dimension for K\mathbb{K}. Suppose that α∈π∗(Σ−dKY)\alpha \in \pi_*(\Sigma^{-d_{\mathbb{K}}}Y) is vv-periodic. Let MK(α)M_{\mathbb{K}}(\alpha) be the corresponding complex or quaternionic Mahowald-invariant coset.

Chromatic redshift conjecture. If α∉MK(α)\alpha \notin M_{\mathbb{K}}(\alpha), then MK(α)M_{\mathbb{K}}(\alpha) consists entirely of vnv_n-torsion elements. If w:ΣdY→Yw:\Sigma^dY\to Y is a power of vv annihilating every element of MK(α)M_{\mathbb{K}}(\alpha), and Z=cofib⁡(w)Z=\operatorname{cofib}(w), so that ZZ has type n+1n+1 and every element of MK(α)M_{\mathbb{K}}(\alpha) extends to a map from ZZ to a suitable sphere, then at least one of these maps is vn+1v_{n+1}-periodic.

This is proposed as a generalization of the Mahowald–Ravenel redshift conjecture. The surrounding discussion says that the earlier conjecture is supported by low-height computations, while the proposed complex and quaternionic generalization remains open.

References

Primary source

Boris Botvinnik and J. D. Quigley, “Symmetries of exotic spheres via complex and quaternionic Mahowald invariants”, arXiv:2309.04275 (2025).

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