AI 中文总结
本研究采用手征SU(3)模型计算热同位旋不对称奇异强子物质的扩散与剪切粘度系数，发现同位旋不对称性和奇异数对扩散系数影响显著，奇异数使剪切粘度大幅增强，相关结果可应用于重离子碰撞实验。
AI 中文摘要
我们研究热同位旋不对称奇异强子物质的扩散系数与剪切粘度系数，在 chiral SU(3)模型框架内，探究重子密度、同位旋、奇异数及温度对核子与超子的影响。该模型中，重子的介质修正源于其与平均标量场和矢量场的相互作用，我们对热奇异强子物质的热力学性质与输运性质展开研究。基于玻尔兹曼方程，在弛豫时间近似下采用一阶Chapman--Enskog展开，计算了与多重电荷（重子数、同位旋、奇异数）相关的扩散矩阵，以及剪切粘度系数。研究发现，介质的同位旋不对称性与奇异数对扩散系数存在显著影响；在介质存在有限奇异数时，由于超子的额外贡献，剪切粘度系数η出现大幅增强；而在核物质与超子物质中，同位旋不对称性对剪切粘度系数的影响均较为微弱。本研究结果可应用于非对称相对论重离子碰撞的实验可观测量，例如德国GSI装置的压缩重子物质（CBM）实验，以及未来的J-PARC-HI项目。
英文摘要
We study the diffusion and shear viscosity coefficients of hot isospin asymmetric strange hadronic matter. The effects due to the baryon density, isospin, strangeness, and temperature on the nucleons and hyperons are studied within a chiral SU(3) model. The medium modifications of the baryons arise due to interactions with the mean scalar and vector fields within the model. The thermodynamic and transport properties are studied in the hot strange hadronic matter. The diffusion matrix associated with the multiple charges (baryon number, isospin, and strangeness), as well as the coefficient of shear viscosity, are computed from the Boltzmann equation using first-order Chapman--Enskog expansion within the relaxation time approximation. There are observed to be significant effects from the isospin asymmetry as well as the strangeness of the medium on the diffusion coefficients. The coefficient of shear viscosity, $η$ is observed to have a large enhancement in the presence of finite strangeness in the medium due to additional contributions from the hyperons. The effects due to isospin asymmetry on the shear viscosity coefficient is however observed to be marginal both in nuclear and hyperonic matter. The present study can be relevant for the experimental observables of asymmetric relativistic heavy-ion collisions, e.g., in the compressed baryonic matter (CBM) experiment at the FAIR facility at GSI as well as in the future J-PARC-HI program.
Comments31 pages, 17 figures
