  In the multiverse, the universes can be created in entangled pairs with
spacetimes that are both expanding in terms of the time variables experienced
by internal observers in their particle physics experiments. The time variables
of the two universes are related by an antipodal-like symmetry that might
explain why there is no antimatter in our universe: at the origin, antimatter
is created, by definition and for any observer, in the observer's partner
universe. The Euclidean region of the spacetime that separates the two
universes acts as a quantum barrier that prevents matter-antimatter from
collapse.
