  A large class of $\Lambda < 0$ cosmologies have big-bang / big crunch
spacetimes with time-symmetric backgrounds and asymptotically AdS Euclidean
continuations suggesting a possible holographic realization. We argue that
these models generically have time-dependent scalar fields, and these can lead
to realistic cosmologies at the level of the homogeneous background geometry,
with an accelerating phase prior to the turnaround and crunch. We first
demonstrate via explicit effective field theory examples that models with an
asymptotically AdS Euclidean continuation can also exhibit a period of
accelerated expansion without fine tuning. We then show that certain
significantly more tuned examples can give predictions arbitrarily close to a
$\Lambda$CDM model. Finally, we demonstrate via an explicit construction that
the potentials of interest can arise from a superpotential, thus suggesting
that these solutions may be compatible with an underlying supersymmetric
theory.
