ON THE ORIGIN OF COSMIC STRUCTURE

A parameter-free theory of the origin and evolution of structure in an initially cold Friedmann universe predicts that self-gravitating systems, from stars and planetary systems to galaxy clusters, are formed from the bottom up by repeated clustering, while a qualitatively different kind of structure, characterized by convex, connected, underdense regions and connected sheetlike or filamentary overdense regions, evolves from quantum fluctuations at the Planck era.