Massive 3D gravity Big Bounce

The properties of an extension of the new massive 3D gravity by scalar matter with Higgs-like self-interaction are investigated. Its perturbative unitarity consistency is verified for a family of cosmological bounce solutions found by the superpotential method. They correspond to the lower bound λ=−1 of the BHT unitarity window and describe eternally accelerated 3D Universe between two initial/final stable dS3 vacua states.