Semilinear hyperbolic systems violating the null condition
@article{Katayama2012SemilinearHS, title={Semilinear hyperbolic systems violating the null condition}, author={Soichiro Katayama and Toshiaki Matoba and Hideaki Sunagawa}, journal={Mathematische Annalen}, year={2012}, volume={361}, pages={275-312} }
We consider systems of semilinear wave equations in three space dimensions with quadratic nonlinear terms not satisfying the null condition. We prove small data global existence of the classical solution under a new structural condition related to the weak null condition. For two-component systems satisfying this condition, we also observe a new kind of asymptotic behavior: Only one component is dissipated and the other one behaves like a non-trivial free solution in the large time.
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