RENORMALIZATION-GROUP THEORY OF THE 3-DIMENSIONAL DILUTE BOSE-GAS

We study the three-dimensional atomic Bose gas using renormalization g roup techniques. Using our knowledge of the microscopic details of the interatomic interaction, we determine the correct initial values of o ur renormalization group equations and thus obtain also information on nonuniversal properties. As a result, we can predict, for instance, t he critical temperature of the gas and the superfluid and condensate d ensity of the Bose-Einstein condensed phase in the regime na Lambda(th )(2) much less than 1, where the average interaction energy is small c ompared to the average kinetic energy.