Sharp Interpolation Inequalities on the Sphere: New Methods and Consequences

Abstract

This paper is devoted to various considerations on a family of sharp interpolation inequalities on the sphere, which in dimension greater than 1 interpolate between Poincaré, logarithmic Sobolev and critical Sobolev (Onofri in dimension two) inequalities. The connection between optimal constants and spectral properties of the Laplace-Beltrami operator on the sphere is emphasized. The authors address a series of related observations and give proofs based on symmetrization and the ultraspherical setting.

Keywords

Sobolev inequality / Interpolation / Gagliardo-Nirenberg inequality / Logarithmic Sobolev inequality / Heat equation

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