Classical blue-shift phenomenon

From papers

Let GG be a finite group and let EE be a vnv_n-periodic non-equivariant ring spectrum. The classical Tate construction is

tG(infeG(E))G.t_{G}({\rm \inf}^G_{e}(E))^G.

Classical blue-shift phenomenon. The spectrum tG(infeG(E))Gt_{G}({\rm \inf}^G_{e}(E))^G is vnsG;Ev_{n-s_{G;E}}-periodic for some positive integer sG;Es_{G;E}. When sG;E>ns_{G;E}>n, the vnsG;Ev_{n-s_{G;E}}-periodic ring spectrum is understood to be the contractible spectrum *. The integer sG;Es_{G;E} is called the blue-shift number. This conjecture generalizes known blue-shift and Tate-vanishing results, including the case of the group Z/2\mathbb{Z}/2 acting on connective complex K-theory; its general validity is not established.

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Primary source

Yangyang Ruan, “A General Blue-Shift Phenomenon”, arXiv:2301.05030 (2025).

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