Sharp constants in weighted trace inequalities on Riemannian manifolds

We establish some sharp weighted trace inequalities $W^{1,2}(ρ^{1-2σ}, M)\hookrightarrow L^{\frac{2n}{n-2σ}}(\pa M)$ on $n+1$ dimensional compact smooth manifolds with smooth boundaries, where $ρ$ is a defining function of $M$ and $σ\in (0,1)$. This is stimulated by some recent work on fractional (conformal) Laplacians and related problems in conformal geometry, and also motivated by a conjecture of Aubin.

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