## A vector field method for relativistic transport equations with applications.(English)Zbl 1373.35046

Summary: We adapt the vector field method of Klainerman to the study of relativistic transport equations. First, we prove robust decay estimates for velocity averages of solutions to the relativistic massive and massless transport equations, without any compact support requirements (in $$x$$ or $$v$$) for the distribution functions. In the second part of this article, we apply our method to the study of the massive and massless Vlasov-Nordström systems. In the massive case, we prove global existence and (almost) optimal decay estimates for solutions in dimensions $$n \geq 4$$ under some smallness assumptions. In the massless case, the system decouples and we prove optimal decay estimates for the solutions in dimensions $$n \geq 4$$ for arbitrarily large data, and in dimension $$3$$ under some smallness assumptions, exploiting a certain form of the null condition satisfied by the equations. The $$3$$-dimensional massive case requires an extension of our method and will be treated in future work.

### MSC:

 35B40 Asymptotic behavior of solutions to PDEs 35Q83 Vlasov equations 83C30 Asymptotic procedures (radiation, news functions, $$\mathcal{H}$$-spaces, etc.) in general relativity and gravitational theory
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### References:

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