Strict cyclotomic Deligne conjecture

For every natural number nn, let O(n)\mathcal{O}^{\cap}(n) be the cylinder-operad space, let THC(A)THC(A) and THH(A)THH(A) be the associated spectra, and let ϕm\phi_m be the cyclotomic structure map. Let ϕm:O(n)(O(nm))Cp\phi_m^{\cap}:\mathcal{O}^{\cap}(n)\to(\mathcal{O}^{\cap}(nm))^{C_p} be the S1S^1-equivariant homeomorphism induced by taking the mm-fold unbranched cover of the cylinder and conformally rescaling it.

Strict cyclotomic Deligne conjecture. For every natural number nn, the following diagram of genuine S1S^1-spectra commutes:

\begin{tikzcd} \Sigma^\infty_+\mathcal{O}^{\cap}(n)\wedge THC(A)^{\wedge n}\wedge THH(A) \ar[r] \ar[d, "\Sigma^\infty_+\phi^{\cap}_m \wedge \Delta_m \wedge \phi_m"]& THH(A)\ar[d, "\phi_m"] \\ (\Sigma^\infty_+\mathcal{O}^{\cap}(nm)\wedge THC(A)^{\wedge nm}\wedge THH(A))^{\Phi C_m} \ar[r]& THH(A)^{\Phi C_m}. \end{tikzcd}

Here the S1S^1-action on THC(A)nTHC(A)^{\wedge n} is trivial, and the left vertical map uses the lax monoidal structure map for geometric fixed points. The statement is the strict genuine-equivariant version; weaker variants replace geometric fixed points by Tate fixed points and require commutativity only up to coherent homotopy. The source presents it conditionally on the preceding colored-operad statement.

Sources & referencesView supporting material

Primary source

Semon Rezchikov, “Noncommutative Cartier Formulae”, arXiv:2607.05360 (2026).

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