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arXiv 0711.2889nucl-th
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相对论性重离子碰撞中流体动力学演化极早期的耗散

Dissipation in the very early stage of the hydrodynamic evolution in relativistic heavy ion collisions

P. Bozek

摘要:

本文对超相对论核碰撞动力学的流体力学模型提出了一个修正。在初始阶段的能量动量张量的修改描述了缺乏各向同性的压力。随后,压力在局部共动标架中向平衡各向同性形式松弛。在Bjorken标度解的约束被发现的能量动量张量的初始各向异性的衰减时间。对于最强的耗散效应允许,我们发现一个相对熵增加约30%,一个显着硬化的横向动量谱,并没有影响的HBT半径。

英文摘要:

We propose a modification of the hydrodynamic model of the dynamics in ultrarelativistic nuclear collisions. A modification of the energy-momentum tensor at the initial stage describes the lack of isotropization of the pressure. Subsequently, the pressure is relaxing towards the equilibrium isotropic form in the local comoving frame. Within the Bjorken scaling solution a bound is found on the decay time of the initial anisotropy of the energy-momentum tensor. For the strongest dissipative effect allowed, we find a relative entropy increase of about 30%, a significant hardening of the transverse momentum spectra, and no effect on the HBT radii.

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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