title: Introduction.
abstract: During the last few years the physics of ultracold atomic gases has experienced an extraordinary development, mostly due to the experimental realization of Bose-Einstein condensation (BEC). This development has being certainly interdisciplinary, bridging the gaps among very different areas, including atomic and molecular physics, quantum optics, condensed matter and solid-state physics, nonlinear physics, quantum information theory, etc.
authors.forename: Luis
authors.initials: L
authors.lastname: Santos