Admissibility, Topology, and the $σ_k$-Loewner--Nirenberg problem

Abstract: The $σ_k$-Loewner--Nirenberg problem is a fully nonlinear generalization of the classical Loewner--Nirenberg problem of constructing complete conformal metrics with constant negative scalar curvature in the interior of domains. For the $σ_k$-version, once $k > 1$, one must impose a negative admissibility condition to ensure ellipticity of the equation. In this note, we exhibit topological obstructions to admissibility and illustrate this with examples.