  Very different strongly interacting quantum systems such as Fermi gases,
quark-gluon plasmas formed in high energy ion collisions and black holes
studied theoretically in string theory are known to exhibit quantitatively
similar damping of hydrodynamic modes. It is not known if such similarities
extend beyond the hydrodynamic limit. Do non-hydrodynamic collective modes in
Fermi gases with strong interactions also match those from string theory
calculations? In order to answer this question, we use calculations based on
string theory to make predictions for novel types of modes outside the
hydrodynamic regime in trapped Fermi gases. These predictions are amenable to
direct testing with current state-of-the-art cold atom experiments.
