
This paper deals with the asymptotic behaviour of the branch of regular positive solutions of the quasilinear eigenvalue problem \[ \Delta_pw= \lambda w^{q-1}+ w^{\alpha-1},\quad w>0\quad\text{in }B,\quad w= 0\quad\text{on }\partial B. \] Here \(\Delta_p\) is the \(p\)-Laplacian, \(B\subset\mathbb{R}^n\) the unit ball, \(1np/(n- p)\) is a supercritical exponent. Although the branch of positive radial solutions, which may be, after suitable scaling, parametrized by \(w(0)\), looks differently depending on whether \(qp+ 4p/(p- 1)\) a further ``critical exponent'' arises: \[ \overline\alpha= p+{p^2\over n- 2-p- 2\sqrt{(n- 1)/(p- 1)}}. \] For small \(\alpha<\overline\alpha\) the solution branch looks like a cork-screw as in small dimensions, while for larger values \(\alpha\geq\overline\alpha\) it approaches \(\lambda= \lambda^*\) asymptotically monotonically. The proof is based on a subtle phase space analysis for a related autonomous system of first order ODE.
asymptotic behaviour of the branch of positive radial solutions, Nonlinear boundary value problems for linear elliptic equations, Asymptotic behavior of solutions to PDEs, quasilinear eigenvalue problem, Degenerate elliptic equations, \(p\)-Laplacian
asymptotic behaviour of the branch of positive radial solutions, Nonlinear boundary value problems for linear elliptic equations, Asymptotic behavior of solutions to PDEs, quasilinear eigenvalue problem, Degenerate elliptic equations, \(p\)-Laplacian
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