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arXiv 1502.06273math.DS
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关于N体问题的弱KAM理论

On weak KAM theory for N-body problems

Ezequiel Maderna

摘要:

考虑具有齐次势$1/r^{2κ}$的N体问题,其中$κ\in(0,1)$,包括牛顿情形($κ=1/2$)。给定$R>0$和$T>0$,我们找到了在时间$T$中约束任意两个包含在某个半径为$R$的球中的构型的路径的最小作用量的一致上界。使用集群分区,我们从这些估计获得的Hölder正则性的临界动作电位(即最小的行动的路径绑定在自由时间的两个配置)。作为应用,我们建立了这类N体问题的弱KAM定理,即证明了Lax-Oleinik半群的不动点的存在性,并证明了它们是相应Hamilton-Jacobi方程的整体黏性解.我们还证明了等距算子在位形空间上的作用存在不变解。

英文摘要:

We consider N-body problems with homogeneous potential $1/r^{2κ}$ where $κ\in(0,1)$, including the Newtonian case ($κ=1/2$). Given $R>0$ and $T>0$, we find a uniform upper bound for the minimal action of paths binding in time $T$ any two configurations which are contained in some ball of radius $R$. Using cluster partitions, we obtain from these estimates Hölder regularity of the critical action potential (i.e. of the minimal action of paths binding in free time two configurations). As an application, we establish the weak KAM theorem for these N-body problems, i.e. we prove the existence of fixed points of the Lax-Oleinik semigroup and we show that they are global viscosity solutions of the corresponding Hamilton-Jacobi equation. We also prove that there are invariant solutions for the action of isometries on the configuration space.

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