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arXiv · 2501.04505

Scalar behavior for a complex multi-soliton arising in blow-up for a semilinear wave equation

Asma Azaiez·Jacek Jendrej·Hatem Zaag
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Abstract

This paper deals with blow-up for the complex-valued semilinear wave equation with power nonlinearity in dimension 1. Up to a rotation of the solution in the complex plane, we show that near a characteristic blow-up point, the solution behaves exactly as in the real-valued case. Namely, up to a rotation in the complex plane, the solution decomposes into a sum of a finite number of decoupled solitons with alternate signs. The main novelty of our proof is a resolution of a complex-valued first order Toda system governing the evolution of the positions and the phases of the solitons.

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Asma Azaiez, Jacek Jendrej, Hatem Zaag. 2026-01-11. Scalar behavior for a complex multi-soliton arising in blow-up for a semilinear wave equation. https://arxiv.org/abs/2501.04505

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