On Multiple Images in Closed Universes

Abstract

Universes with multiconnected spatial sections predict multiple images of cosmic sources. A confusing terminology exists in the naming of these images as real ones vs. ghosts. Here an attempt is made to clarify the situation.

arXiv comment3 pages, 2 figures. Contribution to "Topics in Theoretical Physics, vol II: Festschrift for A. H. Zimerman." Revised version, with a correction on the fundamental polygons