Fluctuations of the particle number in a trapped Bose-Einstein condensate

被引：86

作者：

Grossmann, S

Holthaus, M

机构：

[1] Fachbereich Physik der Philipps-Universität, Marburg, D-35032

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.79.3557

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We develop a reliable procedure for calculating the microcanonical fluctuations of the ground state occupation number for harmonically trapped ideal Bose gases, and show that these fluctuations vanish uniformly when the temperature approaches zero. The key point is the precise determination of the number of microstates from the canonical partition sum, thus avoiding a failure of the usual saddle point method. We also demonstrate why the magnitude of the condensate fluctuations does not depend on the total particle number. [S0031-9007(97)04478-5].

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页码：3557 / 3560

页数：4

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