Generating loops and isolas in semilinear elliptic BVP's

Abstract

In this paper, we ascertain the global $\lambda$-structure of the set of positive and negative solutions bifurcating from $u=0$ for the semilinear elliptic BVP \begin{equation*} \left\{\begin{array}{ll} -dΔu= λ\langle \mathfrak{a},\nabla u\rangle+u+λu^{2}-u^{q} & \text{ in } Ω, \\ u=0 & \text{ on } \partialΩ, \end{array}\right. \end{equation*} according to the values of $d>0$ and the integer number $q\ge 4$. Figures 1.1-1.3 summarize the main findings of this paper according to the values of $d$ and $q$. Note that the role played by the parameter $\lambda$ in this model is very special, because, besides measuring the strength of the convection, it quantifies the amplitude of the nonlinear term $\lambda u^2$. We regard to this problem as a mathematical toy to generate solution loops and isolas in Reaction Diffusion equations.

arXiv commentarXiv admin note: text overlap with arXiv:2105.12193