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arXiv 0911.4707hep-thhep-phnucl-th
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强耦合下重离子碰撞的热化

Toward Thermalization in Heavy Ion Collisions at Strong Coupling

Yuri V. Kovchegov, Shu Lin

备注：
23 pages, 2 figures; v2: typos corrected, references added, version accepted for publication in JHEP
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摘要：

我们发现了两个无源冲击波在AdS $_5$碰撞的捕获面，并得出结论，这种碰撞总是导致创建一个黑洞的散装。由于全息对应，在边界规范理论中，这一结果证明了在强耦合的重离子碰撞中产生了热化介质（夸克-胶子等离子体）（尽管是在${\cal N} =4$超杨-米尔斯理论中）。我们提出了新的证据支持文献中存在的热化时间的解析估计，并发现热化时间比激波停止时间短得多，表明我们的结果可能是相关的描述重离子碰撞实验。

英文摘要：

We find the trapped surface for a collision of two sourceless shock waves in AdS$_5$ and conclude that such collisions always lead to a creation of a black hole in the bulk. Due to holographic correspondence, in the boundary gauge theory this result proves that a thermalized medium (quark-gluon plasma) is produced in heavy ion collisions at strong coupling (albeit in ${\cal N} =4$ super-Yang-Mills theory). We present new evidence supporting the analytic estimate for the time of thermalization that exists in the literature and find that thermalization time is parametrically much shorter than the time of shock wave stopping, indicating that our result may be relevant for description of heavy ion collision experiments.

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