Accelerating cosmology from Λ < 0 gravitational effective field theory

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 time-dependent scalar fields, can lead to realistic at the level homogeneous background geometry, an accelerating phase prior turnaround crunch. first demonstrate via explicit effective field theory examples continuation also exhibit period accelerated expansion without fine tuning. then show certain significantly more tuned give predictions arbitrarily close $\Lambda$CDM model. Finally, we construction potentials interest arise from superpotential, thus solutions may be compatible underlying supersymmetric theory.