瓮模型中多粒子动力学的研究  

Dynamics of many particles in the urn model

作　　者：陈波[1] 童培庆[2] 

机构地区：[1]南京邮电大学通达学院,南京210003 [2]南京师范大学物理科学与技术学院,南京210097

出　　处：《物理学报》2005年第12期5554-5558,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10175035)资助的课题.~~

摘　　要：研究了处于热库中的多颗粒在两个和多个瓮中的运动.通过求解含噪声项的一维朗之万方程,获得颗粒的位置和速度,并分析了其运动状态.研究发现,在高温下系统处于对称态的时间较长,反之系统将会出现多个定态.所有运动颗粒的速率分布都满足Gauss分布,非对称态的有效温度T2与弹性恢复系数r有良好的指数关系.We study the behavior of many particles moving in the 2-urn and 3-urn systems driven by a stochastic heat bath. The velocities and the positions of the particles are calculated through noise activated 1-D Langevin function. We find the time in which the system is in equilibrium becomes longer than the time in which the system is in non-equilibrium as the bath temperature increases. The velocity distribution of the particles is always Gaussian. The effective temperature T2 characterizing nonequilibrium state obeys the power law with the restitution coefficient r.

关 键 词：多颗粒 多瓮 速率分布 有效温度 

分 类 号：O414.1[理学—理论物理]