Abstract
Consider the Klein–Gordon–Zakharov equations in \({\mathbb {R}}^{1+2}\), and we are interested in establishing the small global solution to the equations and in investigating the pointwise asymptotic behavior of the solution. The Klein–Gordon–Zakharov equations can be regarded as a coupled semilinear wave and Klein–Gordon system with quadratic nonlinearities which do not satisfy the null conditions, and the fact that wave components and Klein–Gordon components do not decay sufficiently fast makes it harder to conduct the analysis. In order to conquer the difficulties, we will rely on the hyperboloidal foliation method and a minor variance of the ghost weight method. As a side result of the analysis, we are also able to show the small data global existence result for a class of quasilinear wave and Klein–Gordon system violating the null conditions.
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Notes
Originally E takes values in \({\mathbb {R}}^2\), but more general cases of taking values in \({\mathbb {C}}^{N_0}\) with \(N_0 = 1, 2, \cdots \) can also be treated.
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The author is very grateful to the anonymous referees for their patience with the manuscript. Their suggestions and comments help greatly improve the presentation and precision of the paper.
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Dong, S. Asymptotic Behavior of the Solution to the Klein–Gordon–Zakharov Model in Dimension Two. Commun. Math. Phys. 384, 587–607 (2021). https://doi.org/10.1007/s00220-021-04003-3
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DOI: https://doi.org/10.1007/s00220-021-04003-3