Schematic representation of a periodic structure of identical galaxies and their surroundings in the D–M universe. A galaxy core is represented by a condensed object at the center of a cubic cell, while a depletion zone, occupying about 50% of the cell volume, surrounds the galaxy. Antimatter is spread out beyond this depletion zone, on the outskirts of the cell, occupying also nearly 50% of the cell volume, although its volume appears smaller in the 2D projection.