End of Chapter 2
Conclusions 
2.1) If there is antimatter in our universe, then there must have formed dark backward time evolving antimatter galaxies, probably in the voids.
2.2) The amounts of matter and antimatter in our universe are more or less equal.
2.3) The gravitation of antimatter at our side of the time border acts as repelling gravity, as an antigravitation.
2.4) (After the black bar) A mass and an antimass (mass made of antimatter) of equal size will not influence each other's path by gravitation.
2.5) The time border is empty, no mass is collecting there.
2.6) If a vacuum marble is a structure, it changes into its enantiomer, when passing the time border.
2.7) The time border around each quark at the surface of the Earth is calculated as a sphere of 10^-21 m. As long as the quarks do not near within this sphere, their reactions on Earth work out forward time evolving, quarks as well as antiquarks.
2.8) Mass absorb from the Higgs field, antimass (antimatter) emits to the Higgs field.
2.9) The photon exists of an electron and a positron massless coinciding. Therefore the photon is wiped from the list of elementary particles.
Discussion
2.1) When one performs the put-velocities-in-a-box
method in backward time direction one obtains an outward displacement with an outward directed constant acceleration. A real antigravity. However, that is not what is wanted in backward time evolving areas as observed by us. Wanted is when a planet circles around a sun, then in the film played backward the planet is still circling that sun, albeit in the opposite direction.
2.2) At the beginning of the universe our matter went forward in time while the antimatter went in backward time direction, starting from the Big Bang. On itself this is a direct and simple explanation why there is no antimatter in our universe: starting from the Big Bang matter goes forward and antimatter goes backward in time. However, in this website antimatter, just as abundant as matter, is taken as source of the acceleration of the expansion of the universe.
My guess is there is a second Big Bang in our future, most probably (but not necessarily) preceded by a Big Crunch of our universe. From that second Big Bang matter goes forward in time and antimatter goes backward in time, the latter entering our universe. Since our matter originates from the 1st Big Bang and our antimatter originates from the 2nd Big Bang, their relative amounts, their simultaneous densities, not necessarily have to match.
2.3) There can appear paradoxes. Shown is that usually events tend to avoid paradoxes, e.g. the time border keeps itself empty of particles (except for the vacuum particles of course). But one can manipulate circumstances such that a paradox must appear, see e.g. The meeting at page 8 of FORWARD BACKWARD TIME DIRECTION. What happens then? Expected can be the superposition of all possible outcomes.
