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arXiv 2009.13487nucl-thhep-ph
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具有类Skyrme标量相互作用α物质的Phase diagram

Phase diagram of alpha matter with Skyrme-like scalar interaction

Leonid M. Satarov, Roman V. Poberezhnyuk, Igor N. Mishustin, Horst Stoecker

摘要:

在平均场近似下,研究了由$α$粒子组成的强相互作用物质的物态方程和相图。粒子的相互作用包括通过Skyrme的平均场,包含吸引和排斥的条款。模型参数是通过拟合由Clark和Wang的微观计算得到的$α$物质基态的结合能和重子密度的已知值得到的。计算了$α$物质在中能重离子碰撞中所能达到的温度和重子密度的宽域中的热力学量。该模型预测了$α$粒子的一级液-气相变和玻色-爱因斯坦凝聚。给出了$α$物质等熵轨道上的标度方差、声速和等容热容的分布。强密度波动预测在温度$T_c\approx 14~\textrm{MeV}$和密度$n_c\approx 0.012~\textrm{fm}^{-3}$的临界点附近。

英文摘要:

The equation of state and phase diagram of strongly interacting matter composed of $α$ particles are studied in the mean-field approximation. The particle interactions are included via a Skyrme-like mean field, containing both attractive and repulsive terms. The model parameters are found by fitting known values of binding energy and baryon density in the ground state of $α$ matter, obtained from microscopic calculations by Clark and Wang. Thermodynamic quantities of $α$ matter are calculated in the broad domains of temperature and baryon density, which can be reached in heavy-ion collisions at intermediate energies. The model predicts both first-order liquid-gas phase transition and Bose-Einstein condensation of $α$ particles. We present the profiles of scaled variance, sound velocity and isochoric heat capacity along the isentropic trajectories of $α$ matter. Strong density fluctuations are predicted in the vicinity of the critical point at temperature $T_c\approx 14~\textrm{MeV}$ and density $n_c\approx 0.012~\textrm{fm}^{-3}$.

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