  The Eisenhart lift of a Paul Trap used to store ions in molecular physics is
a linearly polarized periodic gravitational wave. A modified version of
Dehmelt's Penning Trap is in turn related to circularly polarized periodic
gravitational waves, sought for in inflationary models. Similar equations rule
also the Lagrange points in Celestial Mechanics. The explanation is provided by
anisotropic oscillators.
