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arXiv 2208.04449nucl-thhep-ph
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相对论核碰撞中的自旋-热剪切耦合

Spin-thermal shear coupling in relativistic nuclear collisions

M. Buzzegoli, F. Becattini, G. Inghirami, I. Karpenko, A. Palermo

摘要:

重离子碰撞中发射粒子的自旋极化测量为相对论流体中自旋物理的新唯象研究开辟了可能性。全球极化的理论预测与数据一致,但一致的差异突出的本地极化。我们表明,相对论量子流体在局部平衡的协变理论意味着一个额外的,非耗散贡献的自旋极化矢量,这是成比例的热剪切,这是以前被忽视。这一额外的贡献,连同改进的近似的局部平衡密度算子的扩展,恢复的理论预测和实验数据之间的定量协议。

英文摘要:

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.

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