  Relativity and quantum mechanics are generalized by considering a finite
limit for the smallest measurable distance. The value a of this quantum of
length is unknown, but it is a universal constant, like c and h. It depends on
the total energy content of our universe (hc/2a) and physical laws are modified
when it is finite. The eigenvalues of (x, y, z, ct) coordinates are integer or
half-integer multiples of a. This yields four new quantum numbers, specifying
"particle states" in terms of phase differences at the smallest possible scale.
They account for all known elementary particles and predict the existence of
neutral ones that could constitute dark matter particles. This theory is thus
experimentally testable.
