AI 中文总结
研究通过14矩近似从玻尔兹曼-弗拉索夫方程推导超相对论等离子体电阻磁流体动力学框架，得出二阶方程。均匀极限下电荷电流动力学有对应定律，纯电场能产生动量各向异性，比约肯膨胀下该各向异性持续但居次要。
AI 中文摘要
我们通过14矩近似，直接从玻尔兹曼-弗拉索夫方程推导出了无质量、带相反电荷的双组分超相对论等离子体的相对论电阻磁流体动力学框架。所得二阶方程通过电场将净电荷扩散电流与剪切应力张量耦合，所有输运系数均以封闭的微观形式给出。在均匀极限下，对于中等场强，电荷电流动力学可用弛豫型欧姆定律很好地描述，而大粘度会使系统进入标准以色列-斯图尔特公式中不存在的欠阻尼振荡状态。最显著的是，即使没有任何潜在的流动梯度，纯电场也会产生相当大的动量各向异性。在比约肯膨胀下，这种场致各向异性持续存在，但相对于流体动力学膨胀源变得次要。
英文摘要
We derive relativistic resistive magnetohydrodynamics framework for a two-component ultrarelativistic plasma of massless, oppositely charged particles directly from the Boltzmann-Vlasov equation using the 14-moment approximation. The resulting second-order equations couple the net-charge diffusion current to the shear-stress tensor through the electric field, with all transport coefficients given in closed microscopic form. In the homogeneous limit, the charge-current dynamics is well described by relaxation-type Ohm's law for moderate field strengths, while large viscosity drives the system into an underdamped oscillatory regime absent from the standard Israel-Stewart formulation. Most strikingly, a purely electric field generates sizable momentum anisotropy even without any underlying flow gradient. Under Bjorken expansion this field-induced anisotropy persists but becomes subleading to the hydrodynamic expansion source.
CommentsContribution to Strangeness in Quark Matter (SQM) 2026
