Fractional weighted isoperimetric ratio strict inequality conjecture

Let nn be the boundary dimension, let γ(0,12]\gamma\in(0,\frac{1}{2}] with n>2γn>2\gamma, and let (X,gˉ)(\overline{X},\bar{g}) be a smooth compactification that is not conformally diffeomorphic to the Euclidean unit ball (BN,gRN)(\mathbb{B}^N,g_{\mathbb{R}^N}). Let Θn,γ(X,g+,[hˉ])\Theta_{n,\gamma}(X,g^+,[\bar{h}]) be the corresponding fractional weighted isoperimetric variational problem, and let Θn,γ\Theta_{n,\gamma} and θn,γ\theta_{n,\gamma} denote the quantities appearing in the source's inequality. Fractional weighted isoperimetric conjecture. If n>2γn>2\gamma and (X,gˉ)(\overline{X},\bar{g}) is not conformally diffeomorphic to (BN,gRN)(\mathbb{B}^N,g_{\mathbb{R}^N}), then holds. Consequently, the variational problem Θn,γ(X,g+,[hˉ])\Theta_{n,\gamma}(X,g^+,[\bar{h}]) is attainable. This extends the preceding strict-inequality expectation to the fractional weighted setting; the source presents it as a proposed conjecture, and no resolution is supplied.

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Primary source

Sangdon Jin and Seunghyeok Kim, “Weighted isoperimetric ratios and extension problems for fractional conformal Laplacians”, arXiv:2310.09160 (2024).

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