Dual variational methods for a nonlinear Helmholtz system

  • Rainer MandelEmail author
  • Dominic Scheider


This paper considers a pair of coupled nonlinear Helmholtz equations
$$\begin{aligned} {\left\{ \begin{array}{ll} -\,\Delta u - \mu u = a(x) \left( |u|^\frac{p}{2} + b(x) |v|^\frac{p}{2} \right) |u|^{\frac{p}{2} - 2}u,\\ -\,\Delta v - \nu v = a(x) \left( |v|^\frac{p}{2} + b(x) |u|^\frac{p}{2} \right) |v|^{\frac{p}{2} - 2}v \end{array}\right. } \end{aligned}$$
on \(\mathbb {R}^N\) where \(\frac{2(N+1)}{N-1}< p < 2^*\). The existence of nontrivial strong solutions in \(W^{2, p}(\mathbb {R}^N)\) is established using dual variational methods. The focus lies on necessary and sufficient conditions on the parameters deciding whether or not both components of such solutions are nontrivial.


Nonlinear Helmholtz sytem Dual variational methods 

Mathematics Subject Classification

Primary 35J50 Secondary 35J05 


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Karlsruhe Institute of TechnologyInstitute for AnalysisKarlsruheGermany

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