论文标题
纵向和横向扩张的相互作用在重离子碰撞的动力学中
Interplay of longitudinal and transverse expansion in the kinetic dynamics of heavy-ion collisions
论文作者
论文摘要
沉重离子碰撞的早期动力学涉及远离均衡进化的快速动力。动力学的早期平衡阶段可以使用动力学方程进行建模。该预平衡阶段对从发射颗粒的横向动量衍生而来的最终可观察物的影响很小。求解了非增强系统的松弛时间近似中的动力学方程。发现流动相对于反应平面在不同速度的不对称性对进化中的非平衡程度非常敏感。这表明可以研究速度奇数的流动流以识别非平衡效应的发生，并估算碰撞中纵向和横向之间压力的不对称性。
The early dynamics in heavy-ion collisions involves a rapid, far from equilibrium evolution. This early pre-equilibrium stage of the dynamics can be modeled using kinetic equations. The effect of this pre-equilibrium stage on final observables derived from transverse momenta of emitted particles is small. The kinetic equations in the relaxation time approximation for a non-boost invariant system are solved. The asymmetry of the flow with respect to the reaction plane at different rapidities is found to be very sensitive to the degree of non-equilibrium in the evolution. This suggests that the rapidity odd directed flow could be studied to identify the occurrence of non-equilibrium effects and to estimate the asymmetry of the pressure between the longitudinal and transverse directions in the collision.
