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May  2003, 9(3): 577-584. doi: 10.3934/dcds.2003.9.577

Oscillatory blow-up in nonlinear second order ODE's: The critical case


Laboratoire Analyse, Géométrie et Applications, UMR CNRS 7539, Institut Galillée, Université Paris Nord, 93430 Villetaneuse, France


Departement of Mathematics, Lebanese University, P.O.box 155/012 Beirut, Lebanon


Département de Mathématiques, Université de Picardie, INSSET, 02109 St-Quentin

Received  November 2001 Revised  November 2002 Published  February 2003

Consider the equation

$u''+|u|^{p-1}u=b|u'|^{q-1}u',\quad t\geq 0,\qquad $(E)

where $p$, $q>1$ and $b>0$ are real numbers. A detailed study of the large-time behavior of solutions of (E) was carried out in [5]. We here investigate the critical case $q=2p/(p+1)$, which is scale-invariant and was not covered in [5]. We prove that all nontrivial solutions blow-up in finite time and that the asymptotic behavior near blow-up exhibits a strong dependence upon the values of $b$. Namely,
(a) if $b\geq b_1(p):=(p+1)((p+1)/2p)^{p/(p+1)}$, then all solutions blow up with a sign, with the rate

$u(t)$~$\pm (T-t)^{-2/(p-1)}\quad$ as $ t\to T;$

(b) if $b$<$b_1(p)$, then all solutions have oscillatory blow-up, with


where $w(s)$ is a single sign-changing periodic function.
Our proofs rely on perturbed energy arguments, invariant regions and on the study of the equation for $w$ via Poincaré-Bendixson and index theory.

Citation: Mikhaël Balabane, Mustapha Jazar, Philippe Souplet. Oscillatory blow-up in nonlinear second order ODE's: The critical case. Discrete and Continuous Dynamical Systems, 2003, 9 (3) : 577-584. doi: 10.3934/dcds.2003.9.577

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