Mathematics – Analysis of PDEs
Scientific paper
2007-03-29
Annali della Scuola Normale Superiore di Pisa 7 (2008) 313-341
Mathematics
Analysis of PDEs
Scientific paper
We first prove a weighted inequality of Moser-Trudinger type depending on a parameter, in the two-dimensional Euclidean space. The inequality holds for radial functions if the parameter is larger than -1. Without symmetry assumption, it holds if and only if the parameter is in the interval (-1,0]. The inequality gives us some insight on the symmetry breaking phenomenon for the extremal functions of the Hardy-Sobolev inequality, as established by Caffarelli-Kohn-Nirenberg, in two space dimensions. In fact, for suitable sets of parameters (asymptotically sharp) we prove symmetry or symmetry breaking by means of a blow-up method. In this way, the weighted Moser-Trudinger inequality appears as a limit case of the Hardy-Sobolev inequality.
Dolbeault Jean
Esteban Maria J.
Tarantello Gabriella
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