A priori estimates for semistable solutions of semilinear elliptic equations

We consider positive semistable solutions u of Lu + f(u) = 0 with zero Dirichlet boundary condition, where L is a uniformly elliptic operator and f is an element of C-2 is a positive, nondecreasing, and convex nonlinearity which is super-linear at infinity. Under these assumptions, the boundedness o...

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Bibliographic Details
Authors: Cabré Vilagut, Xavier|||0000-0001-5682-3135, Sanchón Rodellar, Manuel, Spruck, Joel
Format: article
Publication Date:2015
Country:España
Institution:Universitat Politècnica de Catalunya (UPC)
Repository:UPCommons. Portal del coneixement obert de la UPC
Language:English
OAI Identifier:oai:upcommons.upc.edu:2117/80798
Online Access:https://hdl.handle.net/2117/80798
https://dx.doi.org/10.3934/dcds.2016.36.601
Access Level:Open access
Keyword:Differential equations, Elliptic
Semi-stable solutions
extremal solutions
regularity
boundedness
semilinear elliptic equations
dimension 4
minimizers
Equacions diferencials
Àrees temàtiques de la UPC::Matemàtiques i estadística
Description
Summary:We consider positive semistable solutions u of Lu + f(u) = 0 with zero Dirichlet boundary condition, where L is a uniformly elliptic operator and f is an element of C-2 is a positive, nondecreasing, and convex nonlinearity which is super-linear at infinity. Under these assumptions, the boundedness of all semistable solutions is expected up to dimension n <= 9, but only established for n <= 4. In this paper we prove the L-infinity bound up to dimension n = 5 under the following further assumption on f: for every epsilon > 0, there exist T = T(epsilon) and C = C(epsilon) such that f '(t) < C f(t)(1+epsilon) for all t > T. This bound will follow from a L-p-estimate for f ' (u) for every p < 3 (and for all n >= 2). Under a similar but more restrictive assumption on f, we also prove the L-infinity estimate when n = 6. We remark that our results do not assume any lower bound on f '.