%0 Journal Article %T Universality in Ultra-Cold Few- and Many-Boson Systems %A Martin Th£¿gersen %J Physics %D 2009 %I arXiv %X This dissertation presents theoretical investigations of universality and finite-range corrections in few- and many-boson systems. The main focus is on ultra-cold atomic gases seen both from the three-body, many-body, and mean-field perspective. Topics include corrections to Efimov physics, the N-body Efimov effect, two-body correlations in condensates and higher-order interactions in mean-field BECs. %U http://arxiv.org/abs/0908.0852v1