The local Oort conjecture for cyclic groups

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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.

References

Primary source

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

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