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A universal characterization of interactions in few- and many-body quantumsystems is often possible without detailed description of the interactionpotential, and has become a defacto assumption for cold atom research.Universality in this context is defined as the validity to fully characterizethe system in terms of two-body scattering length. We discuss universality inthe following three contexts: closed-channel dominated Feshbach resonance,Efimov physics near Feshbach resonances, and corrections to the mean fieldenergy of Bose-Einstein condensates with large scattering lengths. Novelexperimental tools and strategies are discussed to study universality inultracold atomic gases: dynamic control of interactions, run-away evaporativecooling in optical traps, and preparation of few-body systems in opticallattices.

Exploring Universality of Few-Body Physics Based on Ultracold Atoms Near Feshbach Resonances