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The standard model of cosmology is dominated - at the present epoch - by darkenergy. Its voids are rigid and Newtonian within a relativistic background. Themodel prevents them from becoming hyperbolic. Observations of rapid velocityflows out of voids are normally interpreted within the standard model that isrigid in comoving coordinates, instead of allowing the voids' density parameterto drop below critical and their curvature to become negative. Isn't it time toadvance beyond nineteenth century physics and relegate dark energy back to the"no significant evidence" box?

Dark energy with rigid voids versus relativistic voids alone