Abstract
We consider here the 1 D semilinear wave equation with a power nonlinearity and with no restriction on initial data. We first prove a Liouville Theorem for that equation. Then, we consider a blow-up solution, its blow-up curve \({x\mapsto T(x)}\) and \({I_0\subset \mathbb{R}}\) the set of non-characteristic points. We show that I 0 is open and that T(x) is C 1 on I 0. All these results fundamentally use our previous result in [19] showing the convergence in selfsimilar variables for \({x\in I_0}\) .
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Communicated by P. Constantin
This work was supported by a grant from the french Agence Nationale de la Recherche, project ONDENONLIN, reference ANR-06-BLAN-0185.
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Merle, F., Zaag, H. Openness of the Set of Non-characteristic Points and Regularity of the Blow-up Curve for the 1 D Semilinear Wave Equation. Commun. Math. Phys. 282, 55–86 (2008). https://doi.org/10.1007/s00220-008-0532-3
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DOI: https://doi.org/10.1007/s00220-008-0532-3