Abstract The phenomenon of Bose-Einstein condensation of dilute gases in traps is
reviewed from a theoretical perspective. Mean-field theory provides a framework to …

We present a systematic account of several approximations for the Beliaev self-energies for
a uniform dilute Bose gas at finite temperature. We discuss the first-order Popov …

The realization of Bose-Einstein condensation (BEe) in dilute atomic gases [1-5] achieved
several long-standing goals. First, neutral atoms were cooled into the lowest energy state …

We describe the first experiments that study in a controlled way the dynamics of
distinguishable and interpenetrating bosonic quantum fluids. We work with a two-component …

The discovery of Bose–Einstein condensation (BEC) in trapped ultracold atomic gases in
1995 has led to an explosion of theoretical and experimental research on the properties of …

The theoretical description of trapped weakly interacting Bose–Einstein condensates is
characterized by a large number of seemingly very different approaches which have been …

We measure the excitation spectrum of a stable dipolar Bose-Einstein condensate over a
wide momentum range via Bragg spectroscopy. We precisely control the relative strength ε …

Starting from an approximate microscopic model of a trapped Bose-condensed gas at finite
temperatures, we derive an equation of motion for the condensate wavefunction and a …

Collective excitations of a dilute Bose gas were probed above and below the Bose-Einstein
condensation temperature. The temperature dependencies of the frequency and dam** …

Bogoliubov theory for excitations in Bose-Einstein condensates was formulated over 50
years ago to qualitatively explain strongly interacting superfluids. Quantitative experimental …