  The quest for a microscopic foundation of Thermodynamics is addressed within
the Nonunitary Newtonian Gravity model through the study of a specific closed
system, namely a three-dimensional harmonic nanocrystal. A numerical
calculation of the nanocrystal von Neumann entropy as a function of time is
performed, showing a sharp monotonic increase, followed by a stabilization at
late times. This behavior is consistent with the emergence of a micro-canonical
ensemble within the initial energy levels, signaling, in this way, the
establishment of a non-unitary gravity-induced thermal equilibrium.
