Girao's weighted Alexandrov inequality conjecture for strictly convex hypersurfaces

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Let Σ⊂Sn\Sigma\subset\mathbb S^n be a closed, orientable, connected embedded hypersurface, and let HH denote its mean curvature. For x∈Snx\in\mathbb S^n, define

ρx(q)=cos⁡(dSn(x,q)),\rho_x(q)=\cos\left(d_{\mathbb S^n}(x,q)\right),

where dSn(x,q)d_{\mathbb S^n}(x,q) is the geodesic distance from qq to xx, and let ∣Σ∣|\Sigma| be the area of Σ\Sigma and ωn−1\omega_{n-1} the area of the unit (n−1)(n-1)-sphere. Girao's conjecture. If Σ\Sigma is strictly convex, then

sup⁡x∈Sn∫ΣρxH dΣ≥(n−1)ωn−1[(∣Σ∣ωn−1)n−2n−1−(∣Σ∣ωn−1)nn−1].\sup_{x\in\mathbb S^n}\int_\Sigma \rho_x H\,d\Sigma\ge (n-1)\omega_{n-1}\left[\left(\frac{|\Sigma|}{\omega_{n-1}}\right)^{\frac{n-2}{n-1}}-\left(\frac{|\Sigma|}{\omega_{n-1}}\right)^{\frac{n}{n-1}}\right].

Equality should hold if and only if Σ\Sigma is a geodesic sphere. This is an Alexandrov-type weighted curvature inequality in the sphere; the supplied source relates it to work of Girao, but gives no resolution status, so it remains open.

References

Primary source

Kwok-Kun Kwong, Yong Wei, Glen Wheeler and Valentina-Mira Wheeler, “On an inverse curvature flow in two-dimensional space forms”, arXiv:2103.04338 (2021).

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