Properties of condensates in time-dependent shell-shaped geometry

Bose-Einstein condensates (BEC) in shell-shaped geometries are intriguing structures appearing in a wide range of physical settings from optical lattices and ultracold mixtures, to microgravity environments aboard the International Space Station (ISS) and even stellar objects.  Here, building upon previous theoretical works on shell-shaped BEC, we examine the evolution of condensate bubbles in a time-dependent spherical bubble potential. From filled sphere to thin shell geometries, we utilize a non-equilibrium approach to evaluate the relevant physical quantities, such as the particle number, entropy, and condensate fraction. These studies enable us to pinpoint key out-of-equilibrium features of BECs that are within the reach of ISS experiments.