In anomaly-mediated supersymmetry breaking (AMSB) models, superpartner masses
are proportional to couplings squared. Their hidden sectors therefore naturally
contain WIMPless dark matter, particles whose thermal relic abundance is
guaranteed to be of the correct size, even though they are not
weakly-interacting massive particles (WIMPs). We study viable dark matter
candidates in WIMPless AMSB models with non-Abelian hidden sectors and
highlight unusual possibilities that emerge in even the simplest models. In one
example with a pure SU(N) hidden sector, stable hidden gluinos freeze out with
the correct relic density, but have an extremely low, but natural, confinement
scale, providing a framework for self-interacting dark matter. In another
simple scenario, hidden gluinos freeze out and decay to visible Winos with the
correct relic density, and hidden glueballs may either be stable, providing a
natural framework for mixed cold-hot dark matter, or may decay, yielding
astrophysical signals. Last, we present a model with light hidden pions that
may be tested with improved constraints on the number of non-relativistic
degrees of freedom. All of these scenarios are defined by a small number of
parameters, are consistent with gauge coupling unification, preserve the
beautiful connection between the weak scale and the observed dark matter relic
density, and are natural, with relatively light visible superpartners. We
conclude with comments on interesting future directions.Comment: 25 page
