| Issue |
EPL
Volume 139, Number 4, August 2022
|
|
|---|---|---|
| Article Number | 45001 | |
| Number of page(s) | 7 | |
| Section | Atomic, molecular and optical physics | |
| DOI | https://doi.org/10.1209/0295-5075/ac8370 | |
| Published online | 08 August 2022 | |
Universal quantum effect of two-body correlation in a weakly interacting Bose gas
Faculty of Natural Sciences, Technology, Tay Bac University - Son La, Vietnam
(a) phamthesong@utb.edu.vn (corresponding author)
Received: 7 April 2022
Accepted: 21 July 2022
Based on the Cornwall-Jackiw-Tomboulis (CJT) effective action approach and the requirement to preserve the Goldstone theorem within two-loop approximation, we study the universal quantum effect, which is related to the two-body correlation, in a homogeneous weakly interacting Bose gas at zero temperature. We find the state equations that provide the condensate fraction, energy density, chemical potential, and sound speed. They are the series expansions of the gas parameter.
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