Kinetic approach to a relativistic Bose-Einstein condensate.
Kinetic approach to a relativistic Bose-Einstein condensate.
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DOI：
10.1103/physreve.93.032131
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发表时间：
2015-10
期刊：
影响因子：
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通讯作者：
A. Meistrenko;H. van Hees;K. Zhou;C. Greiner
中科院分区：
文献类型：
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作者：
A. Meistrenko;H. van Hees;K. Zhou;C. Greiner
我们应用玻尔兹曼方法的相对论性玻色-爱因斯坦凝聚体的标量玻色子的动力学制度分解的一个粒子分布函数的凝聚体部分和非零动量部分的激发模式，导致一组耦合的演化方程，然后有效地解决了自适应高阶龙格-库塔计划。我们比较我们的结果的部分子级联蒙特卡罗模拟BAMPS的关键，但远离平衡的情况下，无质量玻色子。受QCD中色玻璃凝聚态初始条件的启发，我们还讨论了从大量标量玻色子的初始分布函数出发的时间演化.在这个系统中的粒子级联与非相对论湍流标度在红外部门的自相似演化观察以及相对论指数的直接能量级联，确认弱波湍流在紫外区。
We apply a Boltzmann approach to the kinetic regime of a relativistic Bose-Einstein condensate of scalar bosons by decomposing the one-particle distribution function in a condensate part and a nonzero momentum part of excited modes, leading to a coupled set of evolution equations which are then solved efficiently with an adaptive higher order Runge-Kutta scheme. We compare our results to the partonic cascade Monte Carlo simulation BAMPS for a critical but far from equilibrium case of massless bosons. Motivated by the color glass condensate initial conditions in QCD with a strongly overpopulated initial glasma state, we also discuss the time evolution starting from an overpopulated initial distribution function of massive scalar bosons. In this system a self-similar evolution of the particle cascade with a nonrelativistic turbulent scaling in the infrared sector is observed as well as a relativistic exponent for the direct energy cascade, confirming a weak wave turbulence in the ultraviolet region.