Ps. Wesson et Jp. Deleon, THE EQUATION-OF-MOTION IN KALUZA-KLEIN COSMOLOGY AND ITS IMPLICATIONSFOR ASTROPHYSICS, Astronomy and astrophysics, 294(1), 1995, pp. 1-7
In view of the widespread interest in Kaluza-Klein theory, we derive t
he fully general equation of motion of a particle (charged or neutral)
moving in a spacetime augmented by one extra dimension. We find that
extra terms may be present which can have significant astrophysical im
plications, notably for the peculiar velocities of galaxies. Observati
ons of the latter can in principle be used to decide if the universe h
as four or five dimensions.