Global bi-Lipschitz regularity conjecture for minimisers between doubly connected domains

Let DD and Ω\Omega be doubly connected domains with smooth boundaries, and let ρ\rho be a smooth non-vanishing metric defined on the closure of Ω\Omega. Write Mod(D)\operatorname{Mod}(D) and Mod(Ω)\operatorname{Mod}(\Omega) for their moduli. Global bi-Lipschitz regularity conjecture. If

Mod(D)Mod(Ω),\operatorname{Mod}(D)\leq \operatorname{Mod}(\Omega),

then the minimiser of the ρ\rho-energy is globally bi-Lipschitz continuous and has a smooth extension up to the boundary. The conjecture is motivated by the critical J. C. C. Nitsche configuration, where the minimiser need not be bi-Lipschitz when the modulus inequality fails; the cited context notes that the corresponding Nitsche conjecture for annuli was solved, while this general metric-valued boundary regularity statement remains unresolved.

Sources & referencesView supporting material

Primary source

David Kalaj, “Lipschitz property of minimisers between double connected surfaces”, arXiv:1902.04167 (2019).

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