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arXiv 2002.08781nucl-thhep-ph
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磁场中强子共振气体的各向异性输运性质

Anisotropic transport properties of Hadron Resonance Gas in magnetic field

Ashutosh Dash, Subhasis Samanta, Jayanta Dey, Utsab Gangopadhyaya, Sabyasachi Ghosh, Victor Roy

摘要:

在高能重离子碰撞中,由于碰撞核内旁观质子的存在,产生了强烈的瞬态磁场。磁场在介质中引入各向异性,因此各向同性标量输运系数变为各向异性并分裂成多个分量。在这里,我们计算的各向异性输运系数剪切,体粘度,电导率,和热扩散系数的多组分强子共振气体(HRG)模型的非零磁场通过使用玻尔兹曼输运方程的弛豫时间近似(RTA)。沿磁场的各向异性传输系数分量保持不受磁场的影响,而垂直耗散是由碰撞弛豫时间和磁时标的相互作用,这是逆的回旋频率。我们使用HRG模型计算了各向异性输运系数与温度和磁场的函数关系。中性强子不受洛伦兹力的影响,对各向异性输运没有贡献,我们在HRG模型中估计了各向同性输运和各向异性输运的相对贡献随磁场和温度的变化。我们也给出了有限重子化学势下强子气体的各向异性输运系数的估计。

英文摘要:

An intense transient magnetic field is produced in high energy heavy-ion collisions mostly due to the spectator protons inside the two colliding nucleus. The magnetic field introduces anisotropy in the medium and hence the isotropic scalar transport coefficients become anisotropic and split into multiple components. Here we calculate the anisotropic transport coefficients shear, bulk viscosity, electrical conductivity, and the thermal diffusion coefficients for a multicomponent Hadron- Resonance-Gas (HRG) model for a non-zero magnetic field by using the Boltzmann transport equation in a relaxation time approximation (RTA). The anisotropic transport coefficient component along the magnetic field remains unaffected by the magnetic field, while perpendicular dissipation is governed by the interplay of the collisional relaxation time and the magnetic time scale, which is inverse of the cyclotron frequency. We calculate the anisotropic transport coefficients as a function of temperature and magnetic field using the HRG model. The neutral hadrons are unaffected by the Lorentz force and do not contribute to the anisotropic transports, we estimate within the HRG model the relative contribution of isotropic and anisotropic transports as a function of magnetic field and temperature. We also give an estimation of these anisotropic transport coefficients for the hadronic gas at finite baryon chemical potential.

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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