Universal behaviour of a trapped ultracold gas near Feshbach resonance

Rajat K. Bhaduri,  McMaster University,  Hamilton,  Canada


We consider a trapped ultracold dilute gas of neutral atoms. The phenomenon of Feshbach resonance, and its use to tune the interaction between atoms, are explained in this connection. The so-called universality  of a gas at such a resonance is examined, and some results are reviewed. The connection between quantum and classical virial coefficients is explored.