Is the Spreading of Quantum Mechanical Wave Packets Indeed Inevitable?
arXiv:1209.0711
Abstract
It is demonstrated that -- contrary to the common belief -- it is possible to construct solutions of the non-relativistic Schrödinger equation of a free particle, that do not exhibit dispersion. However, it seems that no normalizable wave packets can be built up by their use, so the spreading of the wave packets is indeed inevitable.
6 pages. Some references have been added and a mistake is corrected which, however, did not influence the final conclusion