论文标题
相对论核冲突中的自旋热剪切耦合
Spin-thermal shear coupling in relativistic nuclear collisions
论文作者
论文摘要
重型离子碰撞中发出的颗粒的自旋极化测量为对相对论流体中自旋物理学的新现象学研究的可能性开辟了可能性。全局极化的理论预测与数据一致，但是一致的差异在局部极化方面脱颖而出。我们表明，在局部平衡处的相对论量子流体的协方差理论意味着对自旋极化载体的额外，非差异的贡献，该载体与先前已经忽略的热剪切成正比。这一额外的贡献，加上在局部平衡密度运算符的扩展中的近似值，恢复了理论预测与实验数据之间的定量一致性。
The spin polarization measurements of particles emitted in heavy-ion collisions have opened the possibility for new phenomenological investigations of spin physics in relativistic fluids. The theoretical predictions of global polarization are in agreement with the data, but consistent discrepancies stand out for the local polarization. We show that the covariant theory of relativistic quantum fluids at local equilibrium implies an additional, non-dissipative contribution to the spin polarization vector, which is proportional to the thermal shear, which has been previously overlooked. This additional contribution, together with an improved approximation in the expansion of the local equilibrium density operator, restores the quantitative agreement between the theoretical predictions and the experimental data.
