随机平均场动力学中的对称破缺和涨落：初始量子涨落的重要性
Symmetry breaking and fluctuations within stochastic mean-field dynamics: importance of initial quantum fluctuations
摘要：
用随机平均场方法研究了Lipkin-Meshkov-Glick模型中的自发对称性破缺和涨落动力学.与标准平均场不同，在随机方法中，初始状态的起伏，被纳入。在弱耦合下，该方法完美地再现了精确的量子动力学。另一方面，为了增加耦合强度，在对称性破缺阈值以上，该方法提供了精确量子演化的总体性质（即时间平均行为）的描述。
英文摘要：
Dynamics of spontaneous symmetry breaking and fluctuations in the Lipkin-Meshkov-Glick model are investigated in a stochastic mean-field approach. Different from the standard mean-field, in the stochastic approach, initial state fluctuations, are incorporated. In weak coupling, the approach perfectly reproduces the exact quantal dynamics. On the other hand, for increasing coupling strength, above the symmetry breaking threshold, the approach provides description of gross properties (i.e. time averaged behavior) of the exact quantal evolution.
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