Superfluids

Superfluid

The definition of a superfluid is:  "a fluid that exhibits frictionless flow, very high heatconductivity, and other unusual physical properties, heliumbelow 2.186 K being the only known example."

From:  http://dictionary.reference.com/browse/superfluid

"We derive the Josephson relation in a superfluid between the condensate density, the superfluid mass density, and the infrared structure of the single particle Green's function by means of diagrammatic perturbation theory. The derivation is valid for finite systems and two dimensions."

From:  http://arxiv.org/abs/cond-mat/0703755