Quantum stochastic description of collisions in a canonical Bose gas

TL;DR

This paper develops a stochastic process model for a one-dimensional Bose gas with three-body collisions, enabling analysis of higher-order correlations and dissipative phenomena in a non-integrable regime, with applications to cooling dynamics.

Contribution

It introduces a stochastic approach to describe the kinetics and correlations of a 1D Bose gas, contrasting the canonical ensemble with the grand canonical, and extends understanding of dissipative processes.

Findings

Time evolution of momentum mode particle number distribution shown

Static structure factor during evaporative cooling analyzed

Canonical ensemble differs significantly from grand canonical ensemble

Abstract

We derive a stochastic process that describes the kinetics of a one-dimensional Bose gas in a regime where three body collisions are important. In this situation the system becomes non integrable offering the possibility to investigate dissipative phenomena more simply compared to higher dimensional gases. Unlike the quantum Boltzmann equation describing the average momentum distribution, the stochastic approach allows a description of higher-order correlation functions in a canonical ensemble. As will be shown, this ensemble differs drastically from the grand canonical one. We illustrate the use of this method by determining the time evolution of the momentum mode particle number distribution and the static structure factor during the evaporative cooling process.