2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/25377An abrupt drop in the moment of inertia recently found in solid helium 4 is explained in terms of dynamics of zero-point vacancies (ZPV). Mechanical decoupling of ZPV from the motion of the container due to Bose statistics is developed to a macroscopic phenomenon by repulsive interaction. It gives a negative answer to the question whether BEC is a necessary condition for non-classical rotational inertia in a bulk three-dimensional system.4 pages, 1 figureStatistical MechanicsSuperconductivitytext