The planar Busemann-Petty centroid inequality and its stability

Ivaki, Mohammad

doi:10.1090/tran/6503

The planar Busemann-Petty centroid inequality and its stability
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Trans. Amer. Math. Soc. 368 (2016), 3539-3563 Request permission

Abstract:

In Centro-affine invariants for smooth convex bodies [Int. Math. Res. Notices. DOI 10.1093/imrn/rnr110, 2012] Stancu introduced a family of centro-affine normal flows, $p$-flow, for $1\leq p<\infty .$ Here we investigate the asymptotic behavior of the planar $p$-flow for $p=\infty$, in the class of smooth, origin-symmetric convex bodies. First, we prove that the $\infty$-flow evolves appropriately normalized origin-symmetric solutions to the unit disk in the Hausdorff metric, modulo $SL(2).$ Second, using the $\infty$-flow and a Harnack estimate for this flow, we prove a stability version of the planar Busemann-Petty centroid inequality in the Banach-Mazur distance. Third, we prove that the convergence of normalized solutions in the Hausdorff metric can be improved to convergence in the $\mathcal {C}^{\infty }$ topology.

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