Lutwak's affine quermassintegral inequality for real, complex, and quaternionic convex bodies

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Let F\mathbb{F} be one of R\mathbb{R}, C\mathbb{C}, or H\mathbb{H}, let p=dim⁡RFp=\dim_{\mathbb{R}}\mathbb{F}, and let K⊂FnK\subset \mathbb{F}^n be a convex body with non-empty interior. Write ∣K∣|K| for its volume, let Gr⁡m(n,F)\operatorname{Gr}_m(n,\mathbb{F}) be the Grassmannian of mm-dimensional F\mathbb{F}-subspaces of Fn\mathbb{F}^n with invariant probability measure dEdE, and for E∈Gr⁡m(n,F)E\in\operatorname{Gr}_m(n,\mathbb{F}) let PEKP_EK denote the orthogonal projection of KK onto EE and ∣PEK∣|P_EK| its volume in EE. Let κrp\kappa_{rp} denote the volume of the Euclidean unit ball in Rrp\mathbb{R}^{rp}. Lutwak's affine quermassintegral conjecture.

∣K∣−m≥(κmp)n(κnp)m∫Gr⁡m(n,F)∣PEK∣−n dE|K|^{-m} \geq \frac{(\kappa_{mp})^n}{(\kappa_{np})^m} \int_{\operatorname{Gr}_m(n,\mathbb{F})} |P_EK|^{-n}\,dE

with equality if and only if KK is a real, complex, or quaternionic ellipsoid, according as F=R\mathbb{F}=\mathbb{R}, C\mathbb{C}, or H\mathbb{H}. This conjecture was recently confirmed by Milman--Yehudayoff, including the complex and quaternionic cases.

References

Primary source

Christos Saroglou and Thomas Wannerer, “Complex and Quaternionic Analogues of Busemann's Random Simplex and Intersection Inequalities”, arXiv:2409.01057 (2024).

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