Finite-size effect of a weakly interacting Bose gas at zero-temperature

We investigate the quantum fluctuation of a weakly interacting Bose gas confined between two parallel plates at zero temperature within two-loop approximation of the Cornwall-Jackiw-Tomboulis (CJT) effective action approach. The finite-size and boundary condition (BC) effects in the excitation atomic density, energy density, chemical potential, and sound speed are determined, including the prediction of a first-order phase transition phenomenon. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study investigates the quantum fluctuation of a weakly interacting Bose gas confined between two parallel plates at zero temperature within the two-loop approximation of the Cornwall-Jackiw-Tomboulis (CJT) effective action approach. The effects of finite size and boundary conditions on the excitation atomic density, energy density, chemical potential, and sound speed are determined, including the prediction of a first-order phase transition phenomenon.