Abstract
In this paper, we show that one-dimension systems of quasilinear wave equations with null conditions admit global classical solutions for small initial data. This result extends Luli, Yang and Yu’s seminal work (Luli et al. in Adv Math 329:174–188, 2018) from the semilinear case to the quasilinear case. Furthermore, we also prove that the global solution is asymptotically free in the energy sense. In order to achieve these goals, we will employ Luli, Yang and Yu’s weighted energy estimates with positive weights, introduce some space-time weighted energy estimates and pay some special attentions to the highest order energies, then use some suitable bootstrap process to close the argument.
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Acknowledgements
The author would like to express his sincere gratitude to Prof. Arick Shao, Prof. Willie Wai-Yeung Wong and Prof. Shiwu Yang for their helpful comments on the topic in this paper. The author was supported by National Natural Science Foundation of China (No. 11801068) and the Fundamental Research Funds for the Central Universities.
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Communicated by M. Struwe.
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