The Frobenius–Witt cotangent complex over the field with one element

From papers

Let RR be an animated Z(p)Z_{(p)}-algebra, and write R/LpR/^Lp for its mod-pp reduction. The Frobenius–Witt cotangent complex FLRF\mathbb L_R is defined over Fp\mathbb F_p, and FF denotes the Frobenius endomorphism of R/LpR/^Lp.

Conjecture on the cotangent complex over the field of one element. There exists a functor

L()/F1:Ani(Ring)Z(p)/D(Z(p))\mathbb L_{(-)/\mathbb F_1}:\operatorname{Ani(Ring)}_{\mathbb Z_{(p)}/}\to \mathcal{D}(\mathbb Z_{(p)})

of \infty-categories, together with a natural equivalence

F(LR/F1RLR/Lp)FLR.F^*(\mathbb L_{R/\mathbb F_1}\otimes_R^L R/^Lp)\simeq F\mathbb L_R.

This conjecture would extend the Frobenius–Witt cotangent complex from a complex over Fp\mathbb F_p to a cotangent complex over Z(p)\mathbb Z_{(p)}, assuming the existence of the field with one element. It is motivated by the Frobenius pullback of the modulo-pp fundamental fiber sequence and the expected transitive fiber sequence for a conjectural map F1RS\mathbb F_1\to R\to S.

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Sources & referencesView supporting material

Primary source

Kanau Shimada, “Frobenius–Witt cotangent complexes”, arXiv:2605.14803 (2026).

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