Weighted HLS inequalities for radial functions and Strichartz estimates for wave and Schroedinger equations

Details Weighted HLS inequalities for radial functions and Strichartz estimates for wave and Schroedinger equations Weighted HLS inequalities for radial functions and Strichartz estimates for wave and Schroedinger equations

2007-11-13

arxiv.org/abs/0711.1933v1

Mathematics

Analysis of PDEs

24 pages. To appear in Illinois Journal of Mathematics

Scientific paper

This paper is concerned with derivation of the global or local in time Strichartz estimates for radially symmetric solutions of the free wave equation from some Morawetz-type estimates via weighted Hardy-Littlewood-Sobolev (HLS) inequalities. In the same way we also derive the weighted end-point Strichartz estimates with gain of derivatives for radially symmetric solutions of the free Schroedinger equation. The proof of the weighted HLS inequality for radially symmetric functions involves an application of the weighted inequality due to Stein and Weiss and the Hardy-Littlewood maximal inequality in the weighted Lebesgue space due to Muckenhoupt. Under radial symmetry we get significant gains over the usual HLS inequality and Strichartz estimate.

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