Annihilation

A second part of the last note has to be written. Not only because finally I didn't write about the decelerator, also because there are more things to take into account about the antimatter: the annihilation.

The matter and the antimatter can not live together. Our universe is composed by matter, but an antimatter universe can exist. It is not possible to distinguish if your existence is in a matter world or in an antimatter one. The antimatter particles has the same stability than matter, but in their universe. The antimatter in a matter world is easily annihilated when it meet its respective matter particle.

This annihilation has some properties because the universe has some rules. There are things that it needs to conserve, like the energy or the momentum. A pair of matter-antimatter, when they annihilate it selves, has to conserve. Then some other types of particles has to be created (mass less like photons, or other exotic particles.