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arXiv 2104.00831nucl-thhep-phnucl-ex
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预平衡夸克-胶子等离子体中磁场的动力学演化

Dynamical evolution of magnetic field in the pre-equilibrium quark-gluon plasma

Li Yan, Xu-Guang Huang

摘要:

高能重离子碰撞产生的极强磁场在夸克-胶子等离子体(QGP)中的手征磁效应(CME)等一系列新的量子现象中起着关键作用。然而,由于耦合电磁场和QGP系统的理论模型的复杂性,特别是在预平衡阶段,磁场在QGP介质中的寿命仍然是不确定的。通过求解耦合的Boltzmann方程组和麦克斯韦方程组,首次建立了一个研究弱耦合QGP早期磁场动力学衰减的动力学框架。我们发现,在晚些时候磁流体动力学描述的耦合系统出现。对于RHIC和LHC的实际碰撞,我们估计了QGP中磁场的剩余强度,当系统开始流体动力学演化时。

英文摘要:

High-energy heavy-ion collisions generate extremely strong magnetic field which plays a key role in a number of novel quantum phenomena in quark-gluon plasma (QGP), such as the chiral magnetic effect (CME). However, due to the complexity in theoretical modellings of the coupled electromagnetic fields and the QGP system, especially in the pre-equilibrium stages, the lifetime of the magnetic field in the QGP medium remains undetermined. We establish, for the first time, a kinetic framework to study the dynamical decay of the magnetic field in the early stages of a weakly coupled QGP by solving the coupled Boltzmann and Maxwell equations. We find that at late times a magnetohydrodynamical description of the coupled system emerges. With respect to realistic collisions at RHIC and the LHC, we estimate the residual strength of the magnetic field in the QGP when the system start to evolve hydrodynamically.

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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