arXiv 1407.85492014-07-31hep-phnucl-th

玻璃体中色磁场的结构

Structure of chromomagnetic fields in the glasma

T. Lappi, A. Dumitru, Y. Nara

备注：: 4 pages, 3 figures, talk by TL at the Quark Matter 2014 conference, Darmstadt, Germany, May 19-24
DOI：: 10.1016/j.nuclphysa.2014.08.007

摘要：

重离子碰撞的初始阶段是由非微扰的强色电场和-磁场控制的。空间威尔逊圈提供了一个规范不变的可观测探测的纵向色磁场的动力学。我们讨论了最近的结果，从实时晶格计算的空间威尔逊圈的期望值的面积依赖性。我们发现，在碰撞后的相对较早的时间，一个普遍的缩放面积的函数出现在大的距离非常不同的初始条件下，一个非平凡的临界指数。类似的行为在较早的胶子横动量谱的计算中已经被看到，它变得独立于规范场的初始谱。我们还显示了空间威尔逊圈的本征值的分布及其实部和虚部的波动。

英文摘要：

The initial stage of a heavy ion collision is dominated by nonperturbatively strong chromoelectric and -magnetic fields. The spatial Wilson loop provides a gauge invariant observable to probe the dynamics of the longitudinal chromomagnetic field. We discuss recent results from a real time lattice calculation of the area-dependence of the expectation value of the spatial Wilson loop. We show that at relatively early times after the collision, a universal scaling as a function of the area emerges at large distances for very different initial conditions, with a nontrivial critical exponent. A similar behavior has earlier been seen in calculations of the gluon transverse momentum spectrum, which becomes independent of the initial spectrum of gauge fields. We also show the distribution of eigenvalues of the spatial Wilson loop and the fluctuations of its real and imaginary parts.

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