Regularity of stable solutions to semilinear elliptic equations on Riemannian models

Daniele Castorina, Manel Sanchón

    Research output: Contribution to journalArticleResearchpeer-review

    13 Citations (Scopus)


    © 2015 by De Gruyter 2015. We consider the reaction-diffusion problem -δgu = f(u) in BR with zero Dirichlet boundary condition, posed in a geodesic ball BR with radius R of a Riemannian model (M, g). This class of Riemannian manifolds includes the classical space forms, i.e., the Euclidean, elliptic, and hyperbolic spaces. For the class of semistable solutions we prove radial symmetry and monotonicity. Furthermore, we establish L∞, Lp, and W1,p estimates which are optimal and do not depend on the nonlinearity f . As an application, under standard assumptions on the nonlinearity λf(u),we prove that the corresponding extremal solution u∗ is bounded whenever n ≤ 9. To establish the optimality of our regularity results we find the extremal solution for some exponential and power nonlinearities using an improved weighted Hardy inequality.
    Original languageEnglish
    Pages (from-to)295-309
    JournalAdvances in Nonlinear Analysis
    Issue number4
    Publication statusPublished - 1 Nov 2015


    • a priori estimates
    • elliptic and hyperbolic spaces
    • improved Hardy inequality
    • Semistable and extremal solutions


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