Many-body t-matrix theory eliminated the infrared divergence on the Bose-Einstein-condensed systems

被引：0

作者：

Ri, Won -Sus ^{[1
]}

Kim, Ha ^{[1
]}

Kim, Gwang-Jin ^{[1
]}

Ri, Su-Bok ^{[1
]}

Kim, Jong -Yon ^{[1
]}

机构：

[1] Univ Sci, Dept Phys, Pyongyang 950003, North Korea

来源：

PHYSICS LETTERS A | 2024年 / 503卷

关键词：

T-matrix; Infrared divergence; Self-energy; Bose-einstein-condensation; Isothermal compressibility;

D O I：

10.1016/j.physleta.2024.129415

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have proved in the many-body t-matrix approximation for the weakly interacting Bose gas the infrared divergences are exactly removed. We also show that this t-matrix becomes very temperature-dependent and, as the temperature approaches to T-c it vanishes at the transition point. This leads to a smooth change of condensate density and compressibility at T-c, implying the second order phase transition occurs at T-c.

引用

页数：6

共 11 条

[1] Theory of the weakly interacting Bose gas [J].