Díaz Díaz, Jesús IldefonsoLazzo, M.Schmidt, P.G.2023-06-192023-06-1920140022-039610.1016/j.jde.2014.08.008https://hdl.handle.net/20.500.14352/33814This paper concerns the blow-up behavior of large radial solutions of polyharmonic equations with power nonlinearities and positive radial weights. Specifically, we consider radially symmetric solutions of mu = c(|x|)|u| p on an annulus {x ∈ Rn | σ ≤ |x| < ρ}, with ρ ∈ (0,∞) and σ ∈ [0, ρ), that diverge to infinity as |x| → ρ. Here n,m ∈ N, p ∈ (1,∞), and c is a positive continuous function on the interval [σ, ρ]. Letting φρ(r) := QCρ/(ρ −r)q for r ∈ [σ, ρ), with q := 2m/(p−1), Q := (q(q +1)···(q +2m−1))1/(p−1), and Cρ := c(ρ)−1/(p−1), we show that, as |x| → ρ, the ratio u(x)/φρ(|x|) remains between positive constants that depend only on m and p. Extending well-known results for the second-order problem, we prove in the fourth-order case that u(x)/φρ(|x|) → 1 as |x| → ρ and obtain precise asymptotic expansions if c is sufficiently smooth at ρ. In certain higher-order cases, we find solutions for which the ratio u(x)/φρ(|x|)does not converge, but oscillates about 1 with non-vanishing amplitude.engjournal articlehttp://www.sciencedirect.com/science/article/pii/S0022039614003350http://www.sciencedirect.com/restricted access517.9Higher-order elliptic equationsPolyharmonic equationsRadial solutionsLarge solutionsBoundary blow-upAsymptotic behaviorEcuaciones diferenciales1202.07 Ecuaciones en Diferencias