A singular perturbation problem for a quasilinear operator satisfying the natural growth condition of Lieberman

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dc.creatorMartinez, Sandra
dc.creatorWolanski, Noemi
dc.date2007-12-27
dc.date.accessioned2026-07-07T08:51:25Z
dc.date.available2026-07-07T08:51:25Z
dc.descriptionIn this paper we study the following problem. For any $\ep>0$, take $u^{\ep}$ a solution of, $$ Łu^{\ep}:= {div}\Big(\di\frac {g(|\nabla \uep|)}{|\nabla \uep|}\nabla \uep\Big)=β_{\ep}(u^{\ep}),\quad u^{\ep}\geq 0. $$ A solution to $(P_{\ep})$ is a function $u^{\ep}\in W^{1,G}(Ω)\cap L^{\infty}(Ω)$ such that $$ \int_Ω g(|\nabla u^{\ep}|) \frac{\nabla u^{\ep}}{|\nabla u^{\ep}|} \nabla ϕdx =-\int_Ω ϕβ_{\ep}(u^{\ep}) dx $$ for every $ϕ\in C_0^{\infty}(Ω)$. Here $β_{\ep}(s)= \frac{1}{\ep} β(\frac{s}{\ep}), $ with $β\in {Lip}(\R)$, $β>0$ in $(0,1)$ and $β=0$ otherwise. We are interested in the limiting problem, when $\ep\to 0$. As in previous work with $Ł=Δ$ or $Ł=Δ_p$ we prove, under appropriate assumptions, that any limiting function is a weak solution to a free boundary problem. Moreover, for nondegenerate limits we prove that the reduced free boundary is a $C^{1,α}$ surface. This result is new even for $Δ_p$. Throughout the paper we assume that $g$ satisfies the conditions introduced by G. Lieberman in \cite{Li1}
dc.identifierhttps://arxiv.org/abs/0712.4266
dc.identifierhttp://arxiv.org/abs/0712.4266
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144933
dc.subjectAnalysis of PDEs
dc.subject35B25, 35B65, 35J65, 35R35
dc.titleA singular perturbation problem for a quasilinear operator satisfying the natural growth condition of Lieberman
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