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arXiv 0804.3774math-phmath.MP
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具有平均场相互作用的量子动力学:一种新的方法

Quantum Dynamics with Mean Field Interactions: a New Approach

Laszlo Erdos, Benjamin Schlein

摘要:

我们提出了一种新的方法来研究一个因式分解的$N$ -粒子玻色子波函数相对于一个有界相互作用势的平均场动力学的时间演化。新的技术,这是基于粒子之间的相关性的增长的控制,导致多粒子薛定谔动力学和单粒子非线性哈特里动力学之间的差异的定量界限。特别是与$N$ -粒子薛定谔方程的解相关联的单粒子密度矩阵被证明收敛到Hartree方程的解所张成的一维子空间上的投影上,并且对于所有固定的时间具有1/N阶的收敛速度。

英文摘要:

We propose a new approach for the study of the time evolution of a factorized $N$-particle bosonic wave function with respect to a mean-field dynamics with a bounded interaction potential. The new technique, which is based on the control of the growth of the correlations among the particles, leads to quantitative bounds on the difference between the many-particle Schrödinger dynamics and the one-particle nonlinear Hartree dynamics. In particular the one-particle density matrix associated with the solution to the $N$-particle Schrödinger equation is shown to converge to the projection onto the one-dimensional subspace spanned by the solution to the Hartree equation with a speed of convergence of order 1/N for all fixed times.

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