  In this paper it is presented the model of a multiverse made up of entangled
pairs of universes. The arrow of time obtained from the principles of
thermodynamics and the arrow of time given by the thermodynamics of
entanglement for single universes are analyzed. The latter requires that the
single universes expand once they have crossed the quantum barrier at the
Euclidean regime. The possible relationship with respect to the grow of local
structures in a single universe is also discussed.
