Canonical Frobenius subalgebra conjecture for flat associative deformations

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Let BB be a local commutative algebra over kk with maximal ideal m⊂B{\mathfrak m} \subset B, and let A~\widetilde{A} be a flat associative algebra over BB such that A=A~/mA = \widetilde{A}/{\mathfrak m} is commutative. Write BpB^p and ApA^p for the corresponding Frobenius-power subalgebras. Canonical Frobenius subalgebra conjecture. There exists a canonical subalgebra A~p⊂A~\widetilde{A}^p \subset \widetilde{A} such that A~p\widetilde{A}^p is flat over Bp⊂BB^p \subset B, the natural map

A~p⊗BpB→A~\widetilde{A}^p \otimes_{B^p} B \to \widetilde{A}

is injective, and the quotient map A~→A\widetilde{A} \to A induces an isomorphism

A~p/mp≅(A~p⊗BpB)/m≅Ap⊂A.\widetilde{A}^p/{\mathfrak m}^p \cong (\widetilde{A}^p \otimes_{B^p} B)/{\mathfrak m} \cong A^p \subset A.

This conjecture proposes a canonical Frobenius-compatible subalgebra in a flat associative deformation whose special fiber is commutative; it is motivated by the preceding results on Frobenius-constant quantizations, but the supplied text does not indicate whether the conjecture is open or resolved.

References

Primary source

R. Bezrukavnikov and D. Kaledin, “Fedosov quantization in positive characteristic”, arXiv:math/0501247 (2007).

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