THE MECHANISM OF DECOHERENCE

On an example of modelling of localisation and movement of a free particle, the possible ways of a substantiation of superposition principle in quantum mechanics, Heisenberg's uncertainty principle, space-time symmetry, the wave nature of particle, spin and decoherence mechanism are presented. When modeling the multiverse idea is used. The possible positions of particle in space which are approximated by periodic function are determined. As the result of research the nonspreading group of plane waves with single peak which is satisfying the Schrödinger equation is obtained.