Deformability in towers for cyclic extensions
Deformability in towers for cyclic extensions
Let , and consider a tower of Galois extensions
Write , , and for the corresponding deformation rings, and let .
Deformability in towers conjecture. If is cyclic, then the natural morphism
is surjective. Equivalently, for every complete discrete valuation ring with residue field , after a finite extension of one can fill in the commutative deformation diagram in the source, and in this case is called deformable in towers.
This conjecture asks whether every deformation of the lower-level cyclic cover can be lifted to the upper level after a finite extension of the base DVR. It is a proposed generalization of known descriptions of deformation rings in certain wildly ramified cases.
Sources & referencesView supporting material
Primary source
Huy Dang, “Deforming cyclic covers in towers”, arXiv:2010.13614 (2023).
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