Nonuniversal beyond-LHY corrections to thermodynamic properties of a weakly interacting Bose gas

TL;DR

This paper explores how finite-range interactions affect the thermodynamics of a weakly interacting Bose gas, revealing nonuniversal corrections beyond the standard LHY approximation.

Contribution

It introduces a theoretical framework to account for finite-range effects on the equation of state and thermodynamics of Bose gases, extending beyond traditional LHY corrections.

Findings

Finite-range effects modify the equation of state.

Thermodynamic properties exhibit nonuniversal behavior due to finite-range interactions.

The approach uses Cornwall-Jackiw-Tomboulis effective action to incorporate these effects.

Abstract

We investigate the effects of finite-range interatomic interactions on the equation of state (EoS) of a weakly interacting Bose gas. Within the Cornwall-Jackiw-Tomboulis effective action approach, we show that finite-range effects influence not only the EoS but also the thermodynamic properties of the system at zero temperature, leading to nonuniversal behavior.