  In this study, the problem of overcoming the infinite energy barrier
separating the bradyonic and tachyonic realms is investigated. Making use of
the Majorana equation for particles with arbitrary spin and the Heisenberg
uncertainty principle, it is proved that, under certain conditions of spatial
confinement, quantum fluctuations allow particles with very small mass and
velocity close to the speed of light to pass in the tachyonic realm, avoiding
the problem of the infinite barrier. This theoretical approach allows an
avoidance of the difficulties encountered in quantum field theory when it is
extended to particles with imaginary rest mass.
