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arXiv 1101.1669cond-mat.stat-mechcond-mat.dis-nn
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玻色-爱因斯坦凝聚与二维行走模型

Bose-Einstein condensation and a two-dimensional walk model

Farhad H. Jafarpour

摘要:

我们引入了一个二维步行模型,其中随机步行者只能在二维平面的第一个四分之一上移动。我们计算的配分函数的步行模型,使用传递矩阵方法,并表明该模型经历了相变。令人惊讶的是,这个二维行走模型的配分函数是完全等于一个驱动扩散系统定义在一个离散的晶格与周期性的边界条件,其中发生相变从高密度到低密度相。驱动扩散系统可以被映射到一个零程的过程中,颗粒可以积累在一个单一的晶格位置在低密度相。这很容易让人联想到真实空间的玻色-爱因斯坦凝聚。

英文摘要:

We introduce a two-dimensional walk model in which a random walker can only move on the first quarter of a two-dimensional plane. We calculate the partition function of this walk model using a transfer matrix method and show that the model undergoes a phase-transition. Surprisingly the partition function of this two-dimensional walk model is exactly equal to that of a driven-diffusive system defined on a discrete lattice with periodic boundary conditions in which a phase transition occurs from a high-density to a low-density phase. The driven-diffusive system can be mapped to a zero-range process where the particles can accumulate in a single lattice site in the low-density phase. This is very reminiscent of real-space Bose-Einstein condensation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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