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arXiv 2603.04263hep-phnucl-th
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量子色动力学的量子动力学理论

Quantum Kinetic Theory for Quantum Chromodynamics

School of Physics and Astronomy, Sun Yat-Sen University(中山大学物理与天文学院)

Shu Lin

AI总结:

本文提出了一种量子色动力学的量子动力学理论,用于描述夸克胶子等离子体中夸克和胶子的自旋极化,并探讨了自旋与轨道角动量的转换机制。

摘要:

我们发展了一种量子动力学理论用于QCD,该理论纳入了所有一阶碰撞项。在梯度展开的最低阶,它能重现考虑弹性与非弹性碰撞的自旋平均波尔兹曼方程。在梯度展开的下一阶,量子动力学方程的解在夸克胶子等离子体中给出了夸克和胶子的自旋极化。耦合强度的幂级数分析显示,在涡旋和非涡旋梯度中,自旋极化行为不同:前者在最低阶不含碰撞贡献,而后者在参数级上包含碰撞贡献,与自由理论的对应项相同。我们还发现,在自旋基底中的非弹性碰撞提供了一种可能的机制,用于自旋角动量与轨道角动量之间的转换。

英文摘要:

We develop a quantum kinetic theory for QCD, which incorporates all leading order collision terms. At lowest order in gradient expansion, it reproduces the spin-averaged Boltzmann equation with both elastic and inelastic collisions. At next order in gradient expansion, the solution to the quantum kinetic equations give spin polarization of on-shell quarks and gluons in quark-gluon plasma when the gradients are of hydrodynamic ones. A power counting in the coupling shows the spin polarization behaves differently in vortical and non-vortical gradients: the former is free of collisional contribution to leading order, while the latter contains a collisional contribution at parametrically the same order as the free theory counterpart. We also find the inelastic collision in a spin basis provides a possible mechanism for conversion between spin and orbital angular momentum.

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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