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arXiv 0903.4736nucl-th
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重子致密物质的相变动力学

Phase transition dynamics for baryon-dense matter

Jorgen Randrup

摘要:

我们构造了一个简单的两相状态方程,旨在类似于压缩的重子丰富的物质,然后在压缩能量密度中引入梯度项,以考虑非均匀配置中的有限程效应。利用这个模型,我们研究了两个共存相之间的界面,并获得相关的界面张力的估计。随后,我们将有限范围的状态方程到理想或粘性流体动力学,并推导出集体色散关系的机械不稳定模式的散装物质的热力学相图的旋节区域。结合这些结果与从现有的动力学输运模拟提取的时间尺度,我们讨论了在核碰撞中发生旋节相分离的前景。我们认为,这些可以通过仔细调整碰撞能量来优化,以最大限度地提高系统在相图的机械不稳定的旋节区域内所花费的时间。我们具体的数值估计表明,谨慎的乐观态度,这种现象实际上可能会发生,但需要一个完整的动态模拟进行详细的评估。

英文摘要:

We construct a simple two-phase equation of state intended to resemble that of compressed baryon-rich matter and then introduce a gradient term in the compressional energy density to take account of fintie-range effects in non-uniform configurations. With this model we study the interface between the two coexisting phases and obtain estimates for the associated interface tension. Subsequently, we incorporate the finite-range equation of state into ideal or viscous fluid dynamics and derive the collective dispersion relation for the mechanically unstable modes of bulk matter in the spinodal region of the thermodynamic phase diagram. Combining these results with time scales extracted from existing dynamical transport simulations, we discuss the prospects for spinodal phase separation to occur in nuclear collisions. We argue that these can be optimized by a careful tuning of the collision energy to maximize the time spent by the bulk of the system inside the mechanically unstable spinodal region of the phase diagram. Our specific numerical estimates suggest cautious optimism that this phenomenon may in fact occur, though a full dynamical simulation is needed for a detailed assessment.

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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