What is the dark energy responsible for the cosmological constant?
In the inflaton spacetime model, the number of spacetime points expands at an enormous rate. An initial inflationary period ends with a phase transition in which all matter is created. Elementary fermions (leptons and quarks) are excited fermionic spacetime points, that is, points that remain above their vacuum or ground state energy after the phase transition. After the phase transition and the mutual annihilation of particles and antiparticles, relatively few points are left with particles. Spacetime as a whole continues to expand, although much more slowly than during the inflationary period because the exclusion principle limits the number of new fermionic points for which there is room in the fermionic lattice. At first the rate of expansion decelerates because of the gravitational attraction of the matter, but eventually it begins to accelerate as the matter density decreases and the accelerating expansion of the point creation process dominates. In this state of accelerating exp
