Abstract
This work is devoted to the analysis of the asymptotic behavior of positive solutions to some problems of variable exponent reaction-diffusion equations, when the boundary condition goes to infinity (large solutions). Specifically, we deal with the equations Δu = u p(x), Δu = −m(x)u + a(x)u p(x) where a(x) ≥ a 0 > 0, p(x) ≥ 1 in Ω, and Δu = e p(x) where p(x) ≥ 0 in Ω. In the first two cases p is allowed to take the value 1 in a whole subdomain \({\Omega_c\subset \Omega}\), while in the last case p can vanish in a whole subdomain \({\Omega_c\subset \Omega}\). Special emphasis is put in the layer behavior of solutions on the interphase Γ i : = ∂Ω c ∩Ω. A similar study of the development of singularities in the solutions of several logistic equations is also performed. For example, we consider −Δu = λ m(x)u−a(x) u p(x) in Ω, u = 0 on ∂Ω, being a(x) and p(x) as in the first problem. Positive solutions are shown to exist only when the parameter λ lies in certain intervals: bifurcation from zero and from infinity arises when λ approaches the boundary of those intervals. Such bifurcations together with the associated limit profiles are analyzed in detail. For the study of the layer behavior of solutions the introduction of a suitable variant of the well-known maximum principle is crucial.
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García-Melián, J., Rossi, J.D. & Sabina de Lis, J.C. An application of the maximum principle to describe the layer behavior of large solutions and related problems. manuscripta math. 134, 183–214 (2011). https://doi.org/10.1007/s00229-010-0391-z
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DOI: https://doi.org/10.1007/s00229-010-0391-z