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arXiv 2107.10322math.AP
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动力学Fokker-Planck-Alliance方程的整体hypoverrity

Global hypocoercivity of kinetic Fokker-Planck-Alignment equations

Roman Shvydkoy

摘要:

本文对集体行为研究中出现的一类动力学Fokker-Planck-Alignment方程建立了次幂和指数松弛的Maxwell方程。不同于以前已知的结果,在这个方向上,专注于收敛附近麦克斯韦,我们的结果是全球性的流体动力学密集的羊群,这有几个后果。特别地,如果通信是长距离的,则收敛是无条件的。如果通信是本地的,那么所有几乎对齐的羊群量化的小费舍尔信息放松麦克斯韦。在后一种情况下,初始数据类在噪声消失极限下是稳定的,即它减少到一个非平凡的和自然类的行波解的无噪声Vlasov-align方程。在我们的方法中的主要新颖之处是适应缓和的Favre过滤的宏观动量到通信协议。这种过滤以前曾被用于可压缩湍流的大涡模拟中,它的新变体出现在非均匀Navier-Stokes系统的Onsager猜想的证明中。光滑解的适定性的严格处理。最后,我们证明了在强噪声和局部排列的限制下,Fokker-Planck-Alignment方程的解Maxwell化为等温压力下宏观流体力学系统的解。

英文摘要:

In this note we establish hypocoercivity and exponential relaxation to the Maxwellian for a class of kinetic Fokker-Planck-Alignment equations arising in the studies of collective behavior. Unlike previously known results in this direction that focus on convergence near Maxwellian, our result is global for hydrodynamically dense flocks, which has several consequences. In particular, if communication is long-range, the convergence is unconditional. If communication is local then all nearly aligned flocks quantified by smallness of the Fisher information relax to the Maxwellian. In the latter case the class of initial data is stable under the vanishing noise limit, i.e.\ it reduces to a non-trivial and natural class of traveling wave solutions to the noiseless Vlasov-Alignment equation. The main novelty in our approach is the adaptation of a mollified Favre filtration of the macroscopic momentum into the communication protocol. Such filtration has been used previously in large eddy simulations of compressible turbulence and its new variant appeared in the proof of the Onsager conjecture for inhomogeneous Navier-Stokes system. A rigorous treatment of well-posedness for smooth solutions is provided. Lastly, we prove that in the limit of strong noise and local alignment solutions to the Fokker-Planck-Alignment equation Maxwellialize to solutions of the macroscopic hydrodynamic system with the isothermal pressure.

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