Simulating nonequilibrium quantum fields with stochastic quantization techniques.
Simulating nonequilibrium quantum fields with stochastic quantization techniques.
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使用随机量子化技术模拟非平衡量子场。
DOI：
10.1103/physrevlett.95.202003
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发表时间：
2005
影响因子：
8.6
通讯作者：
I. Stamatescu
中科院分区：
文献类型：
--
作者：
J. Berges;I. Stamatescu;I. Stamatescu
我们给出了闵可夫斯基时空中非平衡量子场的晶格模拟。从非热初始状态开始，（3 + 1）维的实时量子系综是由一个额外(5)“朗万时间”的随机过程构建的。对于自相互作用标量场的例子，我们展示了如何解决明显的不稳定朗之万动力学，并将我们的量子结果与经典场论中得到的结果进行了比较。这种直接模拟方法对于我们理解强耦合量子多体系统中重核碰撞实验或其他非平衡现象至关重要。
We present lattice simulations of nonequilibrium quantum fields in Minkowskian space-time. Starting from a nonthermal initial state, the real-time quantum ensemble in (3 + 1) dimensions is constructed by a stochastic process in an additional (5th) "Langevin-time." For the example of a self-interacting scalar field, we show how to resolve apparent unstable Langevin dynamics and compare our quantum results with those obtained in classical field theory. Such a direct simulation method is crucial for our understanding of collision experiments of heavy nuclei or other nonequilibrium phenomena in strongly coupled quantum many-body systems.