Mean-Field Dynamics: Singular Potentials and Rate of Convergence

Details Mean-Field Dynamics: Singular Potentials and Rate of Convergence Mean-Field Dynamics: Singular Potentials and Rate of Convergence

2009-07-24

arxiv.org/abs/0907.4313v2

Physics

Mathematical Physics

Typos corrected

Scientific paper

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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