FIG. 3: The plot of the coordinate (solid line) and the momentum (dotted line) of a massless oscillating particle vs time given by (2.23) and (2.24), respectively, where c = 1 ms − $^{1}$, κ 2 = 1 Jm − $^{2}$, r$_{max}$ = 1 m, and T = 4 s. we deal with a “red shift” similar to the gravitational one. It should also be noted that the motion in the segment can be easily obtained from (2.11) by setting x$_{·}$p | x || p | = ± 1, that is x and p are parallel or antiparallel and therefore satisfy x × p = 0 . Evidently, in the case of the system (2.2) this condition is equivalent to J = 0. We point out that the motion in a segment corresponds to the condition r$_{min}$ = 0 and r$_{max}$ = √$_{2}$$_{E}$ κ for the nonnegative solutions to (2.13). We finally remark that the type of motion is completely determined by the values of the energy E and the angular momentum J . Namely, using the parametrization of r$_{min}$ 9