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arXiv 1704.08968cond-mat.quant-gas
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$1/N$ -玻色气体临界温度的展开式

$1/N$-expansion for the critical temperature of the Bose gas

Orest Hryhorchak, Volodymyr Pastukhov

摘要:

本文修正了具有短程排斥的三维玻色系统的大$N$展开式。特别地,对于模型势,其特征在于仅由$s$ -波散射长度$a$的充分的数值计算的临界温度的$1/N$ -近似作为气体参数$an^{1/3}$的函数进行。除了已知的稀限结果外,我们还解析地估计了玻色-爱因斯坦凝聚转变温度的首阶强耦合行为。结果表明,非理想玻色气体的临界温度漂移在小$an^{1/3}$处增大,达到某一极大值后下降为负值。

英文摘要:

We revised the large-$N$ expansion for a three-dimensional Bose system with short-range repulsion in normal phase. Particularly, for the model potential that is characterised only by the $s$-wave scattering length $a$ the full numerical calculations of the critical temperature in the $1/N$-approximation as a function of the gas parameter $an^{1/3}$ are performed. Additionally to the well-known result in the dilute limit we estimated analytically the leading-order strong-coupling behavior of the Bose-Einstein condensation transition temperature. It is shown that the critical temperature shift of the non-ideal Bose gas grows at small $an^{1/3}$, reaches some maximal value and then falls down becoming negative.

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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