A logarithmic Hardy inequality
Del Pino, Manuel; Dolbeault, Jean; Filippas, Stathis; Tertikas, Achilles (2010), A logarithmic Hardy inequality, Journal of Functional Analysis, 259, 8, p. 2045-2072. http://dx.doi.org/10.1016/j.jfa.2010.06.005
TypeArticle accepté pour publication ou publié
External document linkhttp://arxiv.org/abs/0912.0590v1
Journal nameJournal of Functional Analysis
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Abstract (EN)We prove a new inequality which improves on the classical Hardy inequality in the sense that a nonlinear integral quantity with super-quadratic growth, which is computed with respect to an inverse square weight, is controlled by the energy. This inequality differs from standard logarithmic Sobolev inequalities in the sense that the measure is neither Lebesgue's measure nor a probability measure. All terms are scale invariant. After an Emden–Fowler transformation, the inequality can be rewritten as an optimal inequality of logarithmic Sobolev type on the cylinder. Explicit expressions of the sharp constant, as well as minimizers, are established in the radial case. However, when no symmetry is imposed, the sharp constants are not achieved by radial functions, in some range of the parameters.
Subjects / KeywordsHardy inequality; Sobolev inequality; Interpolation; Logarithmic Sobolev inequality; Hardy–Sobolev inequalities; Caffarelli–Kohn–Nirenberg inequalities; Scale invariance; Emden–Fowler transformation; Radial symmetry; Symmetry breaking
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