  In this proceedings contribution, we review the exact solution of the
anisotropic hydrodynamics equations for a system subject to Gubser flow. For
this purpose, we use the leading-order anisotropic hydrodynamics equations
which assume that the distribution function is ellipsoidally symmetric in
local-rest-frame momentum. We then prove that the SO(3)_q symmetry in de Sitter
space constrains the anisotropy tensor to be of spheroidal form with only one
independent anisotropy parameter remaining. As a consequence, the exact
solution reduces to the problem of solving two coupled non-linear differential
equations. We show that, in the limit that the relaxation time goes to zero,
one obtains Gubser's ideal hydrodynamic solution and, in the limit that the
relaxation time goes to infinity, one obtains the exact free streaming solution
obtained originally by Denicol et al. For finite relaxation time, we solve the
equations numerically and compare to the exact solution of the
relaxation-time-approximation Boltzmann equation subject to Gubser flow. Using
this as our standard, we find that anisotropic hydrodynamics describes the
spatio-temporal evolution of the system better than all currently known
dissipative hydrodynamics approaches.
