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Article Dans Une Revue Annales de l'Institut Henri Poincaré C, Analyse non linéaire Année : 2019

Semilinear problems with right-hand sides singular at u = 0 which change sign

Résumé

The present paper is devoted to the study of the existence of a solution u for a quasilinear second order differential equation with homogeneous Dirichlet conditions, where the right-hand side tends to infinity at . The problem has been considered by several authors since the 70's. Mainly, nonnegative right-hand sides were considered and thus only nonnegative solutions were possible. Here we consider the case where the right-hand side can change sign but is non negative (finite or infinite) at , while no restriction on its growth at is assumed on its positive part. We show that there exists a nonnegative solution in a sense introduced in the paper; moreover, this solution is stable with respect to the right-hand side and is unique if the right-hand side is nonincreasing in u. We also show that if the right-hand side goes to infinity at zero faster than , then only nonnegative solutions are possible. We finally prove by means of the study of a one-dimensional example that nonnegative solutions and even many solutions which change sign can exist if the growth of the right-hand side is with .
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Dates et versions

hal-03196650 , version 1 (13-04-2021)

Identifiants

Citer

Juan Casado-Díaz, François Murat. Semilinear problems with right-hand sides singular at u = 0 which change sign. Annales de l'Institut Henri Poincaré C, Analyse non linéaire, 2019, 38 (3), pp.877-909. ⟨10.1016/j.anihpc.2020.09.001⟩. ⟨hal-03196650⟩
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