The nonlinear glasma
The nonlinear glasma
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DOI：
10.1103/physrevd.87.014026
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发表时间：
2013-01-31
影响因子：
5
通讯作者：
Schlichting, Soeren
中科院分区：
文献类型：
--
作者：
Berges, Juergen;Schlichting, Soeren
我们研究了重核碰撞后立即产生的玻璃中量子涨落的演化。我们展示了不稳定性的存在如何导致初始小涨落之间的非线性相互作用的增强。非线性动力学导致了一个大动量区内涨落的增强，远远超过了原来不稳定的频带。我们使用SU(2)规范理论的经典统计晶格模拟研究了弱耦合时耦合常数的依赖性，并展示了如何在两粒子不可约有效作用量的框架内解析地理解这些非线性。与分析预期一致，对耦合常数的依赖仅为对数。关于体量的各向同性，我们的结果表明，系统在参变量大的时间尺度上表现出一阶各向异性。尽管如此，我们发现规范不变的压力关联函数对于波动湍流似乎呈现出一种幂定律的行为特征。DOI：10.1103/PhysRevD.87.014026
We study the evolution of quantum fluctuations in the glasma, created immediately after the collision of heavy nuclei. We show how the presence of instabilities leads to an enhancement of nonlinear interactions among initially small fluctuations. The nonlinear dynamics leads to an enhanced growth of fluctuations in a large momentum region, exceeding by far the originally unstable band. We investigate the dependence on the coupling constant at weak coupling using classical statistical lattice simulations for SU(2) gauge theory and show how these nonlinearities can be analytically understood within the framework of two-particle irreducible effective action techniques. The dependence on the coupling constant is only logarithmic, in accordance with analytic expectations. Concerning the isotropization of bulk quantities, our results indicate that the system exhibits an order-one anisotropy on parametrically large time scales. Despite this fact, we find that gauge invariant pressure correlation functions seem to exhibit a power law behavior characteristic for wave turbulence. DOI: 10.1103/PhysRevD.87.014026