arXiv 2107.014672021-07-03nucl-th

相对论重离子碰撞中电磁场的演化及其对粒子流的影响

Electromagnetic field evolution in relativistic heavy-ion collision and its effect on flow of particles

Tewodros Gezhagn, A. K. Chaubey

备注：: 9 pages, 4 figures

摘要：

我们用iEBE-VISHNU框架计算了相对论性重离子碰撞中产生的电磁场。我们从产生粒子的四种可能的电力源（库仑、洛伦兹、法拉第和等离子体）计算了增量漂移速度。这种外部电磁场对粒子的流动谐波的影响进行了研究，我们发现，在整个演化过程中，流动谐波值以非均匀的方式被抑制和唤醒。更确切地说，观察到椭圆流的最大增加接近3%。我们还发现，质量更占主导地位的因素比电荷的变化，由于所产生的电磁场的流量谐波。在此基础上，垂直于反应平面的磁场被发现是相当大的，而不同的径向电力被发现相互抵消。最后，我们发现，电磁场的引入通过在整个演化过程中以不均匀的方式抑制或升高粒子流来影响粒子流。

英文摘要：

We compute the electromagnetic fields generated in relativistic heavy-ion collisions using the iEBE-VISHNU framework. We calculated the incremental drift velocity from the possible four sources of the electric force (coulomb, Lorentz, Faraday, and Plasma-based) on the particles created. The effect of this external electromagnetic field on the flow harmonics of particles was investigated, and we found out that the flow harmonics values get suppressed and rouse in a non-uniform fashion throughout the evolution. More precisely, a maximum of close to three percent increase in elliptic flow was observed. We also found mass more dominant factor than charges for the change in flow harmonics due to the created electromagnetic field. On the top of that, the magnetic field perpendicular to the reaction plane is found to be sizable while the different radial electric forces were found to cancel out each other. Finally, we found out that the inclusion of an electromagnetic field affects the flow of particles by suppressing or rising it in a non-uniform fashion throughout the evolution.

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