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In 1965, the accelerator in the United States was received anti - deuteron (bound state of anti - proton and antineutron). In 1969, physicists discovered the nucleus of anti - gels I-3, consisting of two antiprotons and the antineutron. Then opened and the nucleus of anti - tritium - heavy anti - hydrogen, consisting of one antiproton and two anti - neutron. In principle, one can imagine, and anti - atoms and even large concentrations of anti - matter. Evidence of the presence of anti - matter in the universe would be a strong annihilation radiation coming from the areas of contact with the substance antimatter.
After the annihilation of only 1 gram of matter and antimatter leads to release of 1014 joules of energy in an explosion that is equivalent to the average of the atomic bomb 10 kilotons. However, astrophysics such data does not yet have, and even antiprotons in cosmic rays are quite rare. Already there is little doubt that the Universe is mainly composed of ordinary matter.
But it was not always the case. In the early stages of the universe at very high temperatures, the number of particles and antiparticles are almost the same: a large number of antiprotons (about once every few billion) accounted for the same number of protons and one "extra" proton. Subsequent cooling of the universe, all particles and antiparticles annihilated, ultimately giving rise to photons, and from a tiny excess of particles in the past there was all that surrounds us now. Annihilation photons are gradually cooled, survive today in the form of the CMB. The ratio of current density to the proton density of relic photons and gave us information on the magnitude of the excess of particles over antiparticles in the past. If this excess was not, then there would be a complete mutual annihilation of particles and antiparticles, and as a result there would be a pretty dull universe filled with cold photon gas.
Where did this excess? One hypothesis suggests that the initial state, the number of particles and antiparticles are the same, but then because of the peculiarities in the dynamics of their interaction arose asymmetry.