Dynamics and Thermodynamics of the Low-Temperature Strongly Interacting   Bose Gas
  We measure the zero-temperature equation of state of a homogeneous Bose gas of $^7$Li atoms by analyzing the \emph{in-situ} density distributions of trapped samples. For increasing repulsive interactions our data shows a clear departure from mean-field theory and provides a quantitative test of the many-body corrections first predicted in 1957 by Lee, Huang and Yang. We further probe the dynamic response of the Bose gas to a varying interaction strength and compare it to simple theoretical models. We deduce a lower bound for the value of the universal constant $\xi>0.44(8)$ that would characterize the universal Bose gas at the unitary limit. 
Nir Navon (LKB - Lhomond), Swann Piatecki (LPS), Kenneth John G\"unter   (LKB - Lhomond), Benno Rem (LKB - Lhomond), Trong C...
cond-mat.quant-gas