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arXiv 0907.4313math-phmath.MP
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平均场动力学:奇异势和收敛速度

Mean-Field Dynamics: Singular Potentials and Rate of Convergence

Antti Knowles, Peter Pickl

摘要:

考虑了相互作用势被$N^{-1}$重新标度的$N$全同玻色子系统的时间演化。我们选择初始波函数来描述一个凝聚体,其中所有粒子都处于相同的单粒子状态。众所周知,在平均场极限$N \to \infty$中,量子$N$ -体动力学由非线性Hartree方程控制。使用非微扰方法,我们在两个方向上扩展了以前的平均场极限的结果。首先,我们允许一个大类的奇异相互作用势,以及强大的,可能依赖于时间的外部潜力。其次,我们推导出的量子$N$体动力学的Hartree动力学的收敛速度的界限。

英文摘要:

We consider the time evolution of a system of $N$ identical bosons whose interaction potential is rescaled by $N^{-1}$. We choose the initial wave function to describe a condensate in which all particles are in the same one-particle state. It is well known that in the mean-field limit $N \to \infty$ the quantum $N$-body dynamics is governed by the nonlinear Hartree equation. Using a nonperturbative method, we extend previous results on the mean-field limit in two directions. First, we allow a large class of singular interaction potentials as well as strong, possibly time-dependent external potentials. Second, we derive bounds on the rate of convergence of the quantum $N$-body dynamics to the Hartree dynamics.

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