Calculus of Variations and Geometric Measure Theory
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F. Maggi - R. Neumayer

A bridge between Sobolev and Escobar inequalities and beyond

created by maggi on 08 Sep 2016
modified on 25 Apr 2018


Submitted Paper

Inserted: 8 sep 2016
Last Updated: 25 apr 2018

Journal: Journal of Functional Analysis
Pages: 26
Year: 2017


The classical Sobolev and Escobar inequalities are embedded into the same one-parameter family of sharp trace-Sobolev inequalities on half-spaces. Equality cases are characterized for each inequality in this family by tweaking a well-known mass transportation argument and lead to a new comparison theorem for trace Sobolev inequalities. The case $p=2$ corresponds to a family of variational problems on conformally flat metrics which was previously settled by Carlen and Loss with their method of competing symmetries. In this case minimizers interpolate between conformally flat spherical and hyperbolic geometries, passing through the Euclidean geometry defined by the fundamental solution of the Laplacian.


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