Nonsmooth regular perturbations of singularly perturbed problems

NN Nefedov, AO Orlov, L Recke… - Journal of Differential …, 2023 - Elsevier
We consider families u= u ε, 0 of boundary layer solutions to singularly perturbed quasilinear
problems of the type ε 2 (a (x, u (x), ε) u′(x))′= b (x, u (x), ε) for x∈(− 1, 1), u (− 1)= u′(1) …

A common approach to singular perturbation and homogenization I: Quasilinear ODE systems

NN Nefedov, L Recke - arXiv preprint arXiv:2309.15611, 2023 - arxiv.org
We consider periodic homogenization of boundary value problems for quasilinear second-
order ODE systems in divergence form of the type $ a (x, x/\varepsilon, u (x), u'(x))'= f (x …

Use of very weak approximate boundary layer solutions to spatially nonsmooth singularly perturbed problems

L Recke - Journal of Mathematical Analysis and Applications, 2022 - Elsevier
We consider singularly perturbed Dirichlet problems which are, in the simplest nontrivial
case, of the type ε 2 u ″(x)= f (x, u (x)) for x∈[0, 1], u (0)= u 0, u (1)= u 1. For small ε> 0 we …

Phase separating solutions for two component systems in general planar domains

M Kowalczyk, A Pistoia, G Vaira - Calculus of Variations and Partial …, 2023 - Springer
In this paper we consider a two component system of coupled non linear Schrödinger
equations modeling the phase separation in the binary mixture of Bose–Einstein …

Quantitative linear nondegeneracy of approximate solutions to strongly competitive Gross-Pitaevskii systems in general domains in dimensions

C Sourdis - arXiv preprint arXiv:2405.16667, 2024 - arxiv.org
We consider strongly coupled competitive elliptic systems of Gross-Pitaevskii type that arise
in the study of two-component Bose-Einstein condensates, in general smooth bounded …

New radial solutions of strong competitive M-coupled elliptic system with general form in B 1 (0)

H Chen, X Yang - Nonlinear Differential Equations and Applications …, 2022 - Springer
We construct a smooth radial positive solution for the following m-coupled elliptic system-Δ
ui= f (ui)-β∑ j≠ iuiuj 2, in B 1 (0), ui= 0, i= 1,…, m, on∂ B 1 (0), for β> 0 large enough, where …