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arXiv 1601.07342hep-phhep-thnucl-th
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超导体中的非平衡sphaleron跃迁

Off-equilibrium sphaleron transitions in the Glasma

M. Mace, S. Schlichting, R. Venugopalan

摘要:

我们进行了第一次经典统计实时晶格模拟的拓扑转变的弱耦合,但高度占领的规范场的非平衡态的超相对论性核碰撞后立即创建。通过采用SU(2)规范场简化我们的描述,并忽略它们的纵向膨胀,我们发现拓扑跃迁的速率在热化过程中相对于热散裂子跃迁的速率在初始阶段是强烈增强的,并随时间衰减。这种非平衡过渡率的时间依赖性的定性特征可以理解时,表示在磁屏蔽长度,我们也提取非微扰。通过对陈-西蒙斯数自关联函数($N_{CS}$)的详细研究,揭示了不同于以往对非阿贝尔等离子体热平衡模拟的非马尔可夫演化特征。

英文摘要:

We perform first classical-statistical real time lattice simulations of topological transitions in the non-equilibrium Glasma of weakly coupled but highly occupied gauge fields created immediately after the collision of ultra-relativistic nuclei. Simplifying our description by employing SU(2) gauge fields, and neglecting their longitudinal expansion, we find that the rate of topological transitions is initially strongly enhanced relative to the thermal sphaleron transition rate and decays with time during the thermalization process. Qualitative features of the time dependence of this non-equilibrium transition rate can be understood when expressed in terms of the magnetic screening length, which we also extract non-perturbatively. A detailed investigation of auto-correlation functions of the Chern-Simons number ($N_{CS}$) reveals non-Markovian features of the evolution distinct from previous simulations of non-Abelian plasmas in thermal equilibrium.

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