arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.2203hep-ph
收藏

eta/s是临界值(在相变时)

eta/s is critical (at phase transitions)

Antonio Dobado, Felipe J. Llanes-Estrada, Juan M. Torres-Rincon

摘要:

在相对论性重离子碰撞中,粘数与熵密度之比(KSS数)可以帮助分离强子相图中的临界点。我们认为,这个数量确实有一个最小值在相变或交叉。虽然传统的非相对论气体的迹象指出,甚至在eta/s的分歧时,相变是一级的,因为临界指数是相当低的,这将是更难以确定在RHIC或FAIR。实验数据更可能揭示一阶相变的不连续性或交叉处的平滑最小值。

英文摘要:

The viscosity over entropy density ratio, or KSS number, can help isolate the critical point in the hadron phase-diagram in Relativistic Heavy Ion Collisions. We argue that this quantity does have a minimum at a phase transition or crossover. Although indications from conventional non-relativistic gases point out to even a divergence in eta/s when the phase-transition is first-order, since the critical exponent is rather low, this will be more difficult to ascertain in RHIC or FAIR. The experimental data are more likely to reveal a discontinuity for a first order phase transition or a smooth minimum at a crossover.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑