Blow-up instability in non-linear wave models with distributed parameters

M. O. Korpusov ; E. A. Ovsyannikov

Izvestiya. Mathematics , Tome 84 (2020) no. 3, pp. 449-501.

Résumé

We consider two model non-linear equations describing electric oscillations in systems with distributed parameters on the basis of diodes with non-linear characteristics. We obtain equivalent integral equations for classical solutions of the Cauchy problem and the first and second initial-boundary value problems for the original equations in the half-space $x>0$. Using the contraction mapping principle, we prove the local-in-time solubility of these problems. For one of these equations, we use the Pokhozhaev method of non-linear capacity to deduce a priori bounds giving rise to finite-time blow-up results and obtain upper bounds for the blow-up time. For the other, we use a modification of Levine's method to obtain sufficient conditions for blow-up in the case of sufficiently large initial data and give a lower bound for the order of growth of a functional with the meaning of energy. We also obtain an upper bound for the blow-up time.

Détail

Keywords: non-linear equations of Sobolev type, blow-up, local solubility, non-linear capacity, bounds for the blow-up time.
Mots-clés : destruction

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