The horizonless universe
Edward Harrison · The Astrophysical Journal · 1993
A closed microuniverse that inflates into a macrouniverse loses its particle horizon. The conditions for this rule to apply are discussed. A particular model illustrates how the particle horizon, which limits the range of causal connections, vanishes permanently into the antipode as a result of inflation. Such a closed universe may display in vestigial form on the scale of superclusters the polytopal structure of the original microuniverse.