The local Oort conjecture for cyclic groups

Let kk be an algebraically closed field of characteristic pp, and let GG be a finite group. A GG-Galois extension k[[z]]/k[[t]]k[[z]]/k[[t]] is an integral extension of integrally closed domains that is GG-Galois on the level of fraction fields. The local lifting problem asks whether there exists a discrete valuation ring RR of characteristic zero with residue field kk and a GG-Galois extension R[[Z]]/R[[T]]R[[Z]]/R[[T]] reducing to k[[z]]/k[[t]]k[[z]]/k[[t]], with ZZ and TT reducing to zz and tt, respectively.

Local Oort conjecture. The local lifting problem can always be solved when GG is cyclic.

Through the local-global principle, this would imply that every Galois cover of kk-curves with cyclic inertia groups lifts to characteristic zero, even when its global Galois group is not cyclic.

Sources & referencesView supporting material

Primary source

Andrew Obus and Stefan Wewers, “Cyclic Extensions and the Local Lifting Problem”, arXiv:1203.5057 (2012).

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