损耗过程和夸克—胶子等离子体的演化

本文通过改进极端相对论性流体力学模型研究损耗过程对夸克一胶子等离子体(QGP)演化的影响,并导出和求解了包括损耗项的流体力学方程.计算结果表明损耗过程加速了QGP的演化,明显缩短了QGP的寿命.并且发现损耗过程对实验可测量也有明显影响,在终态粒子平均横动量分布的例子中,计算的结果显示考虑了损耗过程的影响后,理论计算与实验值更为一致.因此,在细致研究QGP时,不能忽略损耗过程的影响.

Dissipative Processes and the Evolution of Quark-gluon Plasma

Influence of the dissipative processes to the evolution of QGP is studied in this paper by modifying the ultrarelativistic hydrodynamic model to include the dissipation.Hydrodynamic equations based on the modification is derived and solved numerically.The results show that the dissipation accelerates the evolution of QGP and shortens its lifetime obviously.The dissipation is also shown to have an obvious influence on experiment observables.In the example of the average transverse momentum distribution of final particles, the calculation is found more consistent with the experiment data when dissipation is considered.So the dissipation can no longer be neglected when QGP is intensively studied.