线性兰道方程作为在均场相互作用下与自由气体中标记粒子轨迹的极限
Linear Landau equation as a limit of a tagged particle in mean field interaction with a free gas
AI总结:
研究在线性兰道方程与均场相互作用下自由气体中标记粒子轨迹的极限关系,通过微观动力学稳定性与概率控制证明收敛性。
摘要:
我们考虑一个在均场相互作用下与密度为N的自由气体处于平衡状态的标记粒子。在维度d≥4的情况下,我们证明当N趋于无穷大时,其轨迹收敛到与线性兰道方程相关的扩散过程的轨迹。收敛性证明依赖于两个关键因素:微观动力学的长时间稳定性结果,以及对粒子反弹概率的控制。
英文摘要:
We consider a tagged particle in mean field interaction with a free gas of density N at equilibrium. In dimensions $d\geq4$, we prove the convergence of its trajectory, as N goes to infinity, to the one of a diffusion process associated with the linear Landau equation. The proof of the convergence of the martingale problem relies on two key ingredients: long time stability results of the microscopic dynamics, and controls on the probability of particle recollisions.
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