  Spinor condensates have proven to be a rich area for probing many-body
phenomena richer than that of an ultracold gas consisting of atoms restricted
to a single spin state. In the strongly correlated regime, the physics
controlling the possible novel phases of the condensate remains largely
unexplored, and few-body aspects can play a central role in the properties and
dynamics of the system through manifestations of Efimov physics. The present
study solves the three-body problem for bosonic spinors using the
hyperspherical adiabatic representation and characterizes the multiple families
of Efimov states in spinor systems as well as their signatures in the
scattering observables relevant for spinor condensates. These solutions exhibit
a rich array of possible phenomena originating in universal few-body physics,
which can strongly affect the spin dynamics and three-body mean-field
contributions for spinor condensates. The collisional aspects of atom-dimer
spinor condensates are also analyzed and effects are predicted that derive from
Efimov physics.
