RENORMALIZATION-GROUP STUDY OF BOSE-EINSTEIN CONDENSATION

Due to tile observation of Bose-Einstein condensation in dilute atomic Rb-87, Li-7, and Na-23 vapors last year, there is currently a great i nterest in tile degenerate dilute Dose gas. Existing theoretical appro aches using basically non-interacting Bogoliubov quasi-particles do no t predict the deviation from the ideal gas critical temperature claime d to be observed in tile experiments. Improving the theoretical analys is by including interactions between the Bogoliubov quasi-particles is however not trivial in the degenerate regime due to infrared divergen cies showing up in regular perturbation theory. Motivated by these asp ects we present a renormalization group study of tile weakly-interacti ng homogeneous Bose gas.