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Nontrivial solutions to boundary value problems for semilinear Δγ-differential equations

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Abstract

In this article, we study the existence of nontrivial weak solutions for the following boundary value problem:

$$ - {\Delta _\gamma }u = f(x,u)\;{\rm{in}}\;\Omega ,\;\;\;\;\;u = 0\;{\rm{on}}\;\partial \Omega ,$$

where Ω is a bounded domain with smooth boundary in \({\mathbb{R}^N},\;\Omega \cap \left\{ {{x_j} = 0} \right\} \ne \emptyset \) for some j, Δγ is a subelliptic linear operator of the type

$${\Delta _\gamma }: = \sum\limits_{j = 1}^N {{\partial _{{x_j}}}(\gamma _j^2{\partial _{{x_j}}}),\;\;\;\;\;{\partial _{{x_j}}}: = {\partial \over {\partial {x_j}}}} ,\;\;\;\;\;N \ge 2,$$

where γ(x) = (γ1(x), γ2(x), …, γN(x)) satisfies certain homogeneity conditions and degenerates at the coordinate hyperplanes and the nonlinearity f(x, ξ) is of subcritical growth and does not satisfy the Ambrosetti-Rabinowitz (AR) condition.

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Acknowledgements

The author warmly thanks the anonymous referees for the careful reading of the manuscript and for their useful and nice comments.

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Correspondence to Duong Trong Luyen.

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This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 101.02-2020.13.

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Luyen, D.T. Nontrivial solutions to boundary value problems for semilinear Δγ-differential equations. Appl Math 66, 461–478 (2021). https://doi.org/10.21136/AM.2021.0363-19

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