The local Oort conjecture for cyclic groups
The local Oort conjecture for cyclic groups
Let be an algebraically closed field of characteristic , and let be a finite group. A -Galois extension is an integral extension of integrally closed domains that is -Galois on the level of fraction fields. The local lifting problem asks whether there exists a discrete valuation ring of characteristic zero with residue field and a -Galois extension reducing to , with and reducing to and , respectively.
Local Oort conjecture. The local lifting problem can always be solved when is cyclic.
Through the local-global principle, this would imply that every Galois cover of -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).
Progress summary
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