Topic: equilibrium

Entropic independence replaces variance with entropy in an analogue of spectral independence. This talk introduces that property and shows how it can yield sharp bounds on the time required for Markov chains to approach equilibrium.

The superfluid fraction measures how much of a fluid supports frictionless motion. This seminar studies low-temperature systems in which external potentials tune that fraction and transport measurements quantify it. For an equilibrium, weakly interacting Bose condensate, the researchers also extract the fraction from a single density image. The approach offers a new measurement route for investigating recently realized supersolid phases.