This vortex is an eddy in a special form of liquid ... To build their quantum simulator, Weinfurtner and her colleagues used superfluid helium, which flows with extraordinarily low viscosity ...

A superfluid vortex controlled in a lab is helping physicists learn more about the behavior of black holes. A whirlpool generated in helium cooled to just a fraction above absolute zero mimics the ...

In this chapter, we review the famous Landau theory of superfluidity at finite temperatures. This theory is based on coupled hydrodynamic equations for the superfluid and normal fluid components.