On singular perturbation problems with Robin boundary condition
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 2 (2003) no. 1, pp. 199-230.

We consider the following singularly perturbed elliptic problem

ϵ 2 Δu-u+f(u)=0,u>0inΩ,ϵu ν+λu=0onΩ,
where f satisfies some growth conditions, 0λ+, and Ω N (N>1) is a smooth and bounded domain. The cases λ=0 (Neumann problem) and λ=+ (Dirichlet problem) have been studied by many authors in recent years. We show that, there exists a generic constant λ * >1 such that, as ϵ0, the least energy solution has a spike near the boundary if λλ * , and has an interior spike near the innermost part of the domain if λ>λ * . Central to our study is the corresponding problem on the half space.

Classification : 35B35, 35J40, 92C40
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Berestycki, Henri; Wei, Juncheng. On singular perturbation problems with Robin boundary condition. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 2 (2003) no. 1, pp. 199-230. http://archive.numdam.org/item/ASNSP_2003_5_2_1_199_0/

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