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arXiv math-ph/0207005math-phcond-matmath.MP
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一维不可穿透玻色子有限系统密度矩阵的Painlevé超越估计

Painlevé transcendent evaluations of finite system density matrices for 1d impenetrable Bosons

P. J. Forrester, N. E. Frankel, T. M. Garoni, N. S. Witte

摘要:

最近实验上实现了超冷碱金属原子的一维玻色气体,重新引起了人们对不可穿透玻色气体的理论性质的关注。主要关注的是有限系统中有效单粒子态的基态占据,因此是玻色-爱因斯坦凝聚的趋势。这需要计算密度矩阵。对于圆上不可穿透的玻色气体,我们用$σ$ -形式的Painlevé VI超越来计算密度矩阵,并进一步证明了密度矩阵满足粒子数的递推关系.对于谐振势阱中不可穿透的玻色气体,在Dirichlet或Neumann边界条件下,我们给出了密度矩阵的行列式形式,一个随机矩阵系综特征值的平均形式,以及在特殊情况下根据Painlevé V和VI的超越关系的估计.我们讨论了我们的结果可以用来计算的基态职业。

英文摘要:

The recent experimental realisation of a one-dimensional Bose gas of ultra cold alkali atoms has renewed attention on the theoretical properties of the impenetrable Bose gas. Of primary concern is the ground state occupation of effective single particle states in the finite system, and thus the tendency for Bose-Einstein condensation. This requires the computation of the density matrix. For the impenetrable Bose gas on a circle we evaluate the density matrix in terms of a particular Painlevé VI transcendent in $σ$-form, and furthermore show that the density matrix satisfies a recurrence relation in the number of particles. For the impenetrable Bose gas in a harmonic trap, and with Dirichlet or Neumann boundary conditions, we give a determinant form for the density matrix, a form as an average over the eigenvalues of an ensemble of random matrices, and in special cases an evaluation in terms of a transcendent related to Painlevé V and VI. We discuss how our results can be used to compute the ground state occupations.

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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