Non-commutative crystalline comparison conjecture

Let KK be a pp-adic field with ring of integers OK\mathcal{O}_K, residue field kk, and absolute Galois group GKG_K. Let WW be the Witt-vector ring and BcrysB_{\operatorname{crys}} the crystalline period ring. For a smooth proper OK\mathcal{O}_K-linear category T\mathcal{T}, write Tk\mathcal{T}_k and TC\mathcal{T}_{\mathcal{C}} for its special and completed generic fibres.

Non-commutative crystalline comparison conjecture. There is an isomorphism of BcrysB_{\operatorname{crys}}-modules

πiTP(Tk;Zp)WBcrysπiLK(1)K(TC)ZpBcrys,\pi_i\operatorname{TP}(\mathcal{T}_k;\mathbb{Z}_p)\otimes_W B_{\operatorname{crys}}\simeq \pi_i L_{K(1)}K(\mathcal{T}_{\mathcal{C}})\otimes_{\mathbb{Z}_p}B_{\operatorname{crys}},

compatible with the GKG_K-action and Frobenius endomorphism. In particular, the pp-adic representation πiLK(1)K(TC)ZpQp\pi_iL_{K(1)}K(\mathcal{T}_{\mathcal{C}})\otimes_{\mathbb{Z}_p}\mathbb{Q}_p is crystalline. This predicts a non-commutative analogue of the crystalline comparison theorem; the source gives no general proof, though related work establishes the commutative comparison theorem and motivates the conjecture.

Sources & referencesView supporting material

Primary source

Keiho Matsumoto, “Crystalline representations and p-adic Hodge theory for non-commutative algebraic varieties”, arXiv:2309.13654 (2025).

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