A time-map description of the one-dimensional (p,q)-Laplacian Fučik spectrum
Abstract
We study a one-dimensional Fučik-type boundary value problem (BVP) driven by the nonhomogeneous, one-dimensional (p,q)-Laplacian, −(|u'|p−2u' + |u'|q−2u')' = λ(u+)p−1 − μ(u-)q−1, u(0)=u(L)=0, L>0, where 1<q<p and λ,μ∈ℝ. The problem is asymmetric: the positive component is paired with the p-power and the negative component with the q-power. This asymmetry prevents the standard homogeneous p-Laplacian scaling argument from producing explicit Fučik curves. We first prove a quadrant reduction theorem. Any positive nodal interval for a solution forces λ>0, and any negative nodal interval forces μ>0. Hence, all sign-changing solutions occur for values of (λ,μ) in the positive quadrant. Outside the positive quadrant, only one-sign solutions can occur. We also formulate the equation as an autonomous planar system and establish existence and uniqueness for its initial value problem in the positive quadrant. We then impose the second Dirichlet condition through a shooting formulation and show that every zero of a nontrivial Dirichlet solution is simple and isolated. This provides the dynamical foundation for the subsequent construction and gluing of nodal humps of solutions. Inside the positive quadrant, we use a classical one-dimensional time-map method to obtain a projected-geometry description of the spectrum, or the set of values of $(λ, μ)$ for which there exist nontrivial solutions. Every nodal solution has a common energy E>0 shared by all positive and negative humps.
Related
- The first non-trivial Fučík curve for the sublinear Dirichlet Laplacian
- Fucik spectrum for operators with rapidly increasing weight and applications
- The complete spectrum of the linearized p-Laplacian at a Sobolev extremal
- Arithmetic classification of the Dirichlet eigenvalues for a one-dimensional nonlocal p-Laplacian problem
- Derivation Algebras of Three-Dimensional Leibniz Algebras: A Complete Description
BibTeX
@misc{zheng2026timemap,
title = {{A time-map description of the one-dimensional (p,q)-Laplacian Fučik spectrum}},
author = {Jingfan Zheng and Adolfo Rumbos},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38272},
eprint = {2610.38272},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38272},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - A time-map description of the one-dimensional (p,q)-Laplacian Fučik spectrum
AU - Jingfan Zheng
AU - Adolfo Rumbos
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38272
UR - https://arxiv.org/abs/2610.38272
AB - We study a one-dimensional Fučik-type boundary value problem (BVP) driven by the nonhomogeneous, one-dimensional (p,q)-Laplacian, −(|u'|^p−2u' + |u'|^q−2u')' = λ(u^+)^p−1 − μ(u^-)^q−1, u(0)=u(L)=0, L>0, where 1<q<p and λ,μ∈ℝ. The problem is asymmetric: the positive component is paired with the p-power and the negative component with the q-power. This asymmetry prevents the standard homogeneous p-Laplacian scaling argument from producing explicit Fučik curves. We first prove a quadrant reduction theorem. Any positive nodal interval for a solution forces λ>0, and any negative nodal interval forces μ>0. Hence, all sign-changing solutions occur for values of (λ,μ) in the positive quadrant. Outside the positive quadrant, only one-sign solutions can occur. We also formulate the equation as an autonomous planar system and establish existence and uniqueness for its initial value problem in the positive quadrant. We then impose the second Dirichlet condition through a shooting formulation and show that every zero of a nontrivial Dirichlet solution is simple and isolated. This provides the dynamical foundation for the subsequent construction and gluing of nodal humps of solutions. Inside the positive quadrant, we use a classical one-dimensional time-map method to obtain a projected-geometry description of the spectrum, or the set of values of $(λ, μ)$ for which there exist nontrivial solutions. Every nodal solution has a common energy E>0 shared by all positive and negative humps.
ER -