S. Stringari

Theory of Bose-Einstein condensation in trapped gases

The phenomenon of Bose-Einstein condensation of dilute gases in traps is reviewed from a theoretical perspective. Mean-field theory provides a framework to understand the main features of the condensation and the role of interactions between particles. Various properties of these systems are discussed, including the density profiles and the energy of the ground-state configurations, the collective oscillations and the dynamics of the expansion, the condensate fraction and the thermodynamic functions. The thermodynamic limit exhibits a scaling behavior in the relevant length and energy scales. Despite the dilute nature of the gases, interactions profoundly modify the static as well as the dynamic properties of the system; the predictions of mean-field theory are in excellent agreement with available experimental results. Effects of superfluidity including the existence of quantized vortices and the reduction of the moment of inertia are discussed, as well as the consequences of coherence such as the Josephson effect and interference phenomena. The review also assesses the accuracy and limitations of the mean-field approach.

Collective Excitations of a Trapped Bose-Condensed Gas

We investigate the low energy excitations of a dilute atomic Bose gas confined in a harmonic trap of frequency

Density of states and evaporation rate of helium clusters

{\ensuremath{\omega}}_{0}

Structural and dynamical properties of superfluid helium: A density-functional approach.

and interacting with repulsive forces. The dispersion law

Measurement of the Temperature Dependence of the Casimir-Polder Force

\ensuremath{\omega}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}{\ensuremath{\omega}}_{0}({2n}^{2}+2n\ensuremath{\ell}+3n+\ensuremath{\ell}{)}^{1/2}

Systematics of liquid helium clusters

for the elementary excitations is obtained for large numbers of atoms in the trap, to be compared with the prediction

Condensate fraction and critical temperature of a trapped interacting Bose gas

\ensuremath{\omega}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}{\ensuremath{\omega}}_{0}(2n+\ensuremath{\ell})

Sum rules and giant resonances in nuclei

of the noninteracting harmonic oscillator model. Here

Quantum tricriticality and phase transitions in spin-orbit coupled Bose-Einstein condensates.

n

Expansion of an Interacting Fermi Gas

is the number of radial nodes and