Effect of realistic interatomic interactions and two-body correlation on the heat capacity of a trapped BEC

TL;DR

This paper investigates how realistic interatomic interactions and two-body correlations influence the heat capacity and critical temperature of a trapped Bose-Einstein Condensate, revealing that repulsive interactions lower the critical temperature.

Contribution

It introduces an approximate many-body theory to analyze the effects of interactions and correlations on BEC thermodynamics, providing new insights into their impact on critical temperature.

Findings

Repulsive interactions lower the critical temperature.

The difference in critical temperatures increases with atom number.

Interactions affect heat capacity compared to non-interacting models.

Abstract

An approximate many-body theory has been used to calculate the heat capacity and the condensate fraction of a BEC with effective repulsive interaction. The effect of interactions has been analyzed and compared with the non-interacting case. It has been found that the repulsive interaction lowers the critical temperature from the value found in the non-interacting case. The difference between the critical temperatures increases with the increase in the total number of atoms in the trap.