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arXiv 2401.04296physics.plasm-phhep-phnucl-th
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三维 Weizsäcker-Williams 场的纵向涨落对 Glasma 压力各向同性化的影响

Effect of Longitudinal Fluctuations of $3$D Weizsäcker-Williams Field on Pressure Isotropization of Glasma

Hidefumi Matsuda, Xu-Guang Huang

AI总结:

本文通过 3+1 维 glasma 模拟研究沿碰撞轴的色荷密度纵向涨落导致的推进不变性破缺,发现不同关联长度下压力各向同性化行为相似,且稀薄阶段中心快度能量密度按 1/τ 衰减。

摘要:

我们利用 3+1 维 glasma 模拟,研究了 boost invariance(推进不变性)破缺对 glasma 中压力各向同性化的影响。这种破缺归因于沿碰撞轴的经典色荷密度的空间涨落。我们给出了在中心快度区以及更宽快度区域内压力和能量密度的数值结果。研究发现,尽管纵向关联长度有所变化,压力各向同性化的行为在定性上是相似的。数值结果表明,在初始阶段,纵向色电磁场得以形成,类似于 boost invariant glasma 中的场。随后,这些场演化为稀薄 glasma,并以类似于稀薄气体的方式沿纵向膨胀。我们还表明,在稀薄 glasma 阶段,中心快度区的能量密度呈现出 1/τ 衰减。

英文摘要:

We investigate the effects of boost invariance breaking on the isotropization of pressure in the glasma, using the $3+1$D glasma simulation. The breaking is attributed to spatial fluctuations of the classical color charge density along the collision axis. We present numerical results for pressure and energy density at mid-rapidity and across a wider rapidity region. It is found that, despite varying longitudinal correlation lengths, the behaviors of the pressure isotropizations are qualitatively similar. The numerical results suggest that, in the initial stage, longitudinal color electromagnetic fields develop, similar to those in the boost invariant glasma. Subsequently, these fields evolve into a dilute glasma, expanding longitudinally in a manner akin to a dilute gas. We also show that the energy density at mid-rapidity exhibits a $1/τ$ decay in the dilute glasma stage.

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。

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