#### Vol. 294, No. 2, 2018

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Sobolev inequalities on a weighted Riemannian manifold of positive Bakry–Émery curvature and convex boundary

### Saïd Ilias and Abdolhakim Shouman

Vol. 294 (2018), No. 2, 423–451
##### Abstract

In this paper, we study some nonlinear elliptic equations on a compact $n$-dimensional weighted Riemannian manifold of positive $m$-Bakry–Émery–Ricci curvature and convex boundary. Our main purpose is to find conditions which imply that such elliptic equations admit only constant solutions. As an application, we obtain weighted Sobolev inequalities with explicit constants that extend the inequalities obtained by Ilias [1983; 1996] in the Riemannian setting. In a last part of the article, as applications we derive a new Onofri inequality, a logarithmic Sobolev inequality and estimates for the eigenvalues of a weighted Laplacian and for the trace of the weighted heat kernel.

 To the memory of our friend A. El Soufi
##### Keywords
Sobolev inequality, Onofri inequality, weighted Riemannian manifold, convex boundary, manifold with density, weighted Laplacian, drifting Laplacian, Bakry–Émery–Ricci curvature, Neumann boundary condition, eigenvalues
##### Mathematical Subject Classification 2010
Primary: 35J60, 53C21, 58J32, 58J50, 58J60
##### Milestones
Received: 17 April 2017
Revised: 3 November 2017
Accepted: 3 November 2017
Published: 20 February 2018
##### Authors
 Saïd Ilias Laboratoire de Mathématiques et Physique Théorique, UMR CNRS 7350 Université François Rabelais de Tours Parc de Grandmont 37200 Tours France Abdolhakim Shouman Laboratoire de Mathématiques et Physique Théorique, UMR CNRS 7350 Université François Rabelais de Tours Parc de Grandmont 37200 Tours France