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arXiv 0807.1093nucl-th
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相对论核碰撞中的退相干和熵产生

Decoherence and Entropy Production in Relativistic Nuclear Collisions

Rainer J. Fries, Berndt Muller, Andreas Schafer

摘要:

相对论重离子对撞机(RHIC)最近的实验表明,夸克和胶子物质的热化时间短于1 fm/c。在基于微扰理论或彩色玻璃凝聚体图像的第一原理计算中,很难证明这种快速热化的合理性。在这里,我们解决胶子场的退相干,这是热化的必要组成部分的相关问题。我们提出了一个简化的首阶计算胶子系综的退相干时间的入射通量的Weizsacker-Williams胶子。我们还讨论了退相干过程中产生的熵及其与实验测得的末态熵的关系。

英文摘要:

Short thermalization times of less than 1 fm/c for quark and gluon matter have been suggested by recent experiments at the Relativistic Heavy Ion Collider (RHIC). It has been difficult to justify this rapid thermalization in first-principle calculations based on perturbation theory or the color glass condensate picture. Here, we address the related question of the decoherence of the gluon field, which is a necessary component of thermalization. We present a simplified leading-order computation of the decoherence time of a gluon ensemble subject to an incoming flux of Weizsacker-Williams gluons. We also discuss the entropy produced during the decoherence process and its relation to the entropy in the final state which has been measured experimentally.

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