Maximum Energy Growth Rate in Dilute Quantum Gases

Anisotropic pseudopotential for polarized dilute quantum gases

An anisotropic pseudopotential arising in the context of collisions of two particles polarized by an external field is rigorously derived and its properties are investigated. Such a low-energy pseudopotential may be useful in describing collective properties of dilute quantum gases, such as molecules polarized by an electric field or metastable P2 atoms polarized by a magnetic field. The pseudo...

Energy and structure of dilute hard- and soft-sphere gases

F. Mazzanti, A. Polls, and A. Fabrocini Departament d’Electrònica, Enginyeria i Arquitectura La Salle, Pg. Bonanova 8, Universitat Ramon Llull, E-08022 Barcelona, Spain Departament d’Estructura i Constituents de la Matèria, Diagonal 645, Universitat de Barcelona, E-08028 Barcelona, Spain Dipartimento di Fisica ‘‘E. Fermi,’’ Università di Pisa, and INFN, Sezione di Pisa, Via Buonarroti, 2, I-561...

Dilute Fermi and Bose Gases

We give a unified perspective on the properties of a variety of quantum liquids using the theory of quantum phase transitions. A central role is played by a zero density quantum critical point which is argued to control the properties of the dilute gas. An exact renormalization group analysis of such quantum critical points leads to a computation of the universal properties of the dilute Bose g...

Bose–Einstein Condensation in Dilute Gases

Superfluidity in Dilute Trapped Bose Gases

A commonly used theoretical definition of superfluidity in the ground state of a Bose gas is based on the response of the system to an imposed velocity field or, equivalently, to twisted boundary conditions in a box. We are able to carry out this program in the case of a dilute interacting Bose gas in a trap. We prove that a gas with repulsive interactions is 100% superfluid in the dilute limit...