I will give a brief introduction to “Generalized Hydrodynamics”, a hydrodynamic description of one-dimensional integrable systems discovered in 2016. I will describe the theory in the context of the one-dimensional Bose gas, where it is particularly simple. I will briefly review how “Generalized Hydrodynamics” is successfully used to describe modern cold atoms experiments.

One experimental effect that is not taken into account in the 2016 theory is the atom losses: I will discuss perspectives on how to include these. As an aside, I will comment on the validity of Tan's contact relation in the one-dimensional Bose gas.