Uniform boundedness for finite Morse index solutions to supercritical semilinear elliptic equations

Abstract We consider finite Morse index solutions to semilinear elliptic questions, and we investigate their smoothness. It is well‐known that: For , there exist Morse index 1 solutions whose norm goes to infinity. For , uniform boundedness holds in the subcritical case for power‐type nonlinearities, while for critical nonlinearities the boundedness of the Morse index does not prevent blow‐up in . In this paper, we investigate the case of general supercritical nonlinearities inside convex domains, and we prove an interior a priori bound for finite Morse index solution in the sharp dimensional range . As a corollary, we obtain uniform bounds for finite Morse index solutions to the Gelfand problem constructed via the continuity method.