ABSTRACT
Starting with the original subquantum dark-energy model, the
current accelerating phase of the evolution of the universe is
considered by constructing the most economical cosmic models
that use just general relativity and some dominating quantum
effects associated with the probabilistic description of quantum
physics. Two of such models are explicitly analyzed. They are based
on the existence of a subquantum potential and correspond to
a generalization of the spatially flat exponential model of the de
Sitter space. The thermodynamics of these two cosmic solutions is
discussed, using the second principle as a guide to choose which
among the two is more feasible. This chapter also discusses the
relativistic physics onwhich themodels are based, their holographic
description, some implications from the classical energy conditions,
and an interpretation of dark energy in terms of the entangled
energy of the universe. Also contained in this chapter is a discussion
of the quantum cosmic models that result from the existence of a
nonzero entropy of entanglement. In such a realm, we obtain new
cosmic solutions for any arbitrary number of spatial dimensions,
studying the stability of these solutions, as well as the emergence
of gravitational waves in the realm of the most general models. The
occurrence of the scaling accelerated phase after matter dominance
has been shown to be rather associated with the existence of
subquantum potentials, which make the effective mass of the matter
particles to vanish at the coincidence time so that a cosmic system
where the matter dominance phase is followed by accelerating
expansion can be allowed.
