  The physical results of quantum field theory are independent of the various
specializations of Dirac's gamma-matrices, that are employed in given problems.
Accordingly, the physical meaning of Majorana's equation is very
dubious,considering that it is a consequence of ad hoc matrix representations
of the gamma-operators. Therefore, it seems to us that this equation cannot
give the equation of motion of the neutral WIMPs (weakly interacting massive
particles), the hypothesized constitutive elements of the Dark Matter.
