  Fluids suspended in expanding laboratory systems cavitate into Voronoi foams
that degenerate through secondary cavitation of the foam walls. This robust
morphological mechanism results from a virtual competition for space between
the cavities. In cosmology, Voronoi foams are known to explain important
features of the large scale structure, but the physical mechanism for the
formation of such foams is unknown. We here present a scenario for the
formation of large scale structure: Cavitation initiates at the abrupt
reduction of radiation pressure on matter at decoupling and results in the cold
flow of matter into a single, void-dominated structure with a scale determined
by the Hubble sphere at decoupling. This mechanism does not impose restrictions
on the smoothness of the last scattering surface at decoupling and conserves
the entropy of matter during the self-organization of a single cavitation foam
spanning the observable universe.
