Short proofs of refined sharp Caffarelli-Kohn-Nirenberg inequalities

Abstract

This note relies mainly on a refined version of the main results of the paper by F. Catrina and D. Costa (J. Differential Equations 2009). We provide very short and self-contained proofs. Our results are sharp and minimizers are obtained in suitable functional spaces. As main tools we use the so-called \textit{expand of squares} method to establish sharp weighted $L^2$-Caffarelli-Kohn-Nirenberg (CKN) inequalities and density arguments.

13 pages

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