The mystery of red shift periodicities

Abstract

This paper briefly reviews the different data sets of extragalactic objects including nearby and distant galaxies and quasars that show statistically significant peaks at periodic intervals of redshifts. At present the data are not complete in any sense but they are substantial enough to make us worry about the fundamental assumption that the universe is homogeneous on a large scale. Moreover, evidence of this kind has not only persisted in spite of rigorous statistical analysis but has grown with time so that it cannot be altogether ignored.