  Dynamics in AdS spacetimes is characterized by various time-periodicities.
The most obvious of these is the time-periodic evolution of linearized fields,
whose normal frequencies form integer-spaced ladders as a direct consequence of
the structure of representations of the conformal group. There are also
explicitly known time-periodic phenomena on much longer time scales inversely
proportional to the coupling in the weakly nonlinear regime. We ask what would
correspond to these long time periodicities in a holographic CFT, provided that
such a CFT reproducing the AdS bulk dynamics in the large central charge limit
has been found. The answer is a very large family of multiparticle operators
whose conformal dimensions form simple ladders with spacing inversely
proportional to the central charge. We give an explicit demonstration of these
ideas in the context of a toy model holography involving a $\phi^4$ probe
scalar field in AdS, but we expect the applicability of the underlying
structure to be much more general.
