Abstract
Given a Riemannian manifold (M,g) and a group G of isometries of (M,g), we investigate the existence G-invariant positive solutions u:M→R to the nonlinear equation Δgu+au=u2⋆(k,s)−1dg(x,Gx0)s+huq−1 where Δg=−divg(∇). The singularity and the nonlinearity are such that the problem is critical for the Hardy-Sobolev embeddings. We prove existence by using the Aubin minimization and the Mountain-Pass lemma of Ambrosetti-Rabinowitz. As a by product of our analysis, we find the value of the best-constant in the associated Hardy-Sobolev inequality.
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