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arXiv 1603.03331hep-phhep-latnucl-th
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强场QCD中瞬态反常电荷的产生

Transient anomalous charge production in strong-field QCD

N. Tanji, N. Mueller, J. Berges

摘要:

本文研究了双色QCD中非平衡轴向电荷的产生。我们从空间均匀的强规范场出发,计算了费米子在真空中的实时演化。理想化的初始条件类的动机是在重离子碰撞的上下文中的玻璃通量管。我们专注于轴向电荷生产在早期,在那里的重要方面的异常动力学可以推导出分析。这是比较实时晶格模拟。利用威尔逊费米子研究了早期夸克产生导致的异常电荷产生。我们的研究结果表明,相干规范场可以瞬时产生大量的轴向电荷密度,而部分感生电荷持续存在,甚至远远超过特征退相干时间。分析结果的比较提供了严格的测试实时表示的轴向异常的晶格。

英文摘要:

We investigate axial charge production in two-color QCD out of equilibrium. We compute the real-time evolution starting with spatially homogeneous strong gauge fields, while the fermions are in vacuum. The idealized class of initial conditions is motivated by glasma flux tubes in the context of heavy-ion collisions. We focus on axial charge production at early times, where important aspects of the anomalous dynamics can be derived analytically. This is compared to real-time lattice simulations. Quark production at early times leading to anomalous charge generation is investigated using Wilson fermions. Our results indicate that coherent gauge fields can transiently produce significant amounts of axial charge density, while part of the induced charges persist to be present even well beyond characteristic decoherence times. The comparisons to analytic results provide stringent tests of real-time representations of the axial anomaly on the lattice.

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