The local refined Oort conjecture for cyclic extensions

Let kk be the residue field of a discrete valuation ring RR of characteristic zero, and let k[[z2]]/k[[x]]k[[z_2]]/k[[x]] be a cyclic Γ\Gamma-extension with Galois sub-extension k[[z1]]/k[[x]]k[[z_1]]/k[[x]]. Suppose R[[Z2]]/R[[X]]R[[Z_2]]/R[[X]] is a lift of the sub-extension. The local refined Oort conjecture. There exist a finite extension RR' of RR and a Γ\Gamma-Galois extension R[[Z2]]/R[[X]]R'[[Z_2]]/R'[[X]] that lifts k[[z2]]/k[[x]]k[[z_2]]/k[[x]] and contains R[[Z2]]/R[[X]]R'[[Z_2]]/R'[[X]] as a sub-extension. By a local-to-global principle, this local assertion is sufficient for the global refined Oort conjecture and concerns extending a prescribed local lift through a cyclic Galois extension.

Sources & referencesView supporting material

Primary source

Huy Dang, “The refined local lifting problem for cyclic covers of order four”, arXiv:2107.01780 (2023).

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