Abstract
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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Acknowledgments
The authors would like to express their sincere gratitude to Prof. Akitaka Matsumura for his comments on the earlier version of this work. The work of S. K. is supported by Grant-in-Aid for Scientific Research (C) (No. 23540241), JSPS. The work of H. S. is supported by Grant-in-Aid for Young Scientists (B) (No. 22740089) and Grant-in-Aid for Scientific Research (C) (No. 25400161), JSPS.
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Dedicated to the memory of Professor Rentaro Agemi.
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Katayama, S., Matoba, T. & Sunagawa, H. Semilinear hyperbolic systems violating the null condition. Math. Ann. 361, 275–312 (2015). https://doi.org/10.1007/s00208-014-1071-1
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DOI: https://doi.org/10.1007/s00208-014-1071-1