Infrared behavior of interacting bosons at zero temperature
N. Dupuis
TL;DR
This paper reviews the infrared properties of interacting bosons at zero temperature, highlighting the limitations of perturbation theory and demonstrating how the non-perturbative renormalization group provides exact correlation functions.
Contribution
It introduces a non-perturbative renormalization group approach to determine the exact infrared behavior of correlation functions in interacting bosons.
Findings
Breakdown of perturbation theory due to infrared divergences
Application of non-perturbative renormalization group methods
Exact infrared correlation functions obtained
Abstract
We review the infrared behavior of interacting bosons at zero temperature. After a brief discussion of the Bogoliubov approximation and the breakdown of perturbation theory due to infrared divergences, we show how the non-perturbative renormalization group enables to obtain the exact infrared behavior of the correlation functions.
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