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arXiv 1909.03216hep-phnucl-th
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手征有效模型中的等熵轨线问题

Aspects of isentropic trajectories in chiral effective models

Rainer Stiele, Wanda Maria Alberico, Andrea Beraudo, Renan Câmara Pereira, Pedro Costa, Hubert Hansen, Mario Motta

摘要:

在重离子碰撞中火球的演化是一个等熵过程,这意味着它在强相互作用的相图中遵循每个重子熵恒定的轨迹。火球的集体加速是由系统的声速决定的,而守恒电荷的涨落则被编码在夸克数的可测量性中:它们一起在最终的可观测量中留下印记。在这里,这种等熵演化将手征有效模型,占手征和中心对称性破缺,两个中心方面的QCD分析。我们的讨论集中在高动量模式的治疗,介子的贡献热力学和夸克的味道的数量的等熵轨迹的影响。

英文摘要:

The evolution of the fireball in heavy ion collisions is an isentropic process, meaning that it follows a trajectory of constant entropy per baryon in the phase diagram of the strong interaction. Responsible for the collective acceleration of the fireball is the speed of sound of the system, while fluctuations of conserved charges are encoded in quark-number susceptibilities: together, they leave their imprint in final observables. Here, this isentropic evolution will be analysed within chiral effective models that account for both chiral and center symmetry breaking, two central aspects of QCD. Our discussion focusses on the impact on the isentropic trajectories of the treatment of high-momentum modes, of the meson contribution to thermodynamics and of the number of quark flavours.

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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