CGC和AdS/CFT重离子碰撞的早期动力学
Early Time Dynamics in Heavy Ion Collisions from CGC and from AdS/CFT
摘要：
本文综述了重离子碰撞早期强相互作用动力学的两种不同的理论方法。一种方法是基于彩色玻璃冷凝物（CGC）的小耦合物理。另一种方法是基于反德西特空间/共形场论（AdS/CFT）对应，可以用来描述大耦合QCD相互作用。我们指出，在理论工具方面，这两种方法有点相似：在CGC中，一个处理核激波碰撞中产生的经典胶子场，而在AdS/CFT中，一个研究引力激波碰撞中的经典引力。然而，我们强调，由此产生的物理是不同的：在CGC中的经典胶子场导致在重离子碰撞中产生的自由流介质，而在5维AdS块体中的经典引力很可能导致理想的流体力学描述所产生的介质。此外，价夸克在碰撞核在CGC继续沿着他们的光锥轨迹碰撞后，反冲非常小，而我们表明，在AdS碰撞核很可能会失去大部分的能量在碰撞和停止。
英文摘要：
We review two different theoretical approaches to the strong interaction dynamics at the early times immediately following heavy ion collisions. One approach is based on small-coupling physics of the Color Glass Condensate (CGC). The other approach is based on Anti-de Sitter space/Conformal Field Theory (AdS/CFT) correspondence and may be applicable to describing large-coupling QCD interactions. We point out that in terms of theoretical tools the two approaches are somewhat similar: in CGC one deals with classical gluon fields produced in a nuclear shock wave collision, while in AdS/CFT one studies classical gravity in a gravitational shock wave collision. We stress, however, that the resulting physics is different: the classical gluon fields in CGC lead to a free-streaming medium produced in heavy ion collisions, while the classical gravity in the 5-dimensional AdS bulk is likely to lead to ideal hydrodynamics description of the produced medium. Also, the valence quarks in colliding nuclei in CGC continue along their light cone trajectories after the collision with very little recoil, while we show that in AdS the colliding nuclei are likely to lose most of their energy in the collision and stop.
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