Expanding-domain scale factor evolution for the biscale partition models illustrated in Fig. 1, comparing evolution of this domain according to the VQZA model (silent virialisation) and according to the standard N-body EdS “Newtonian” constraint (instantaneous feedback from virialisation). The VQZA scale factor evolution (+ symbols) correspond from bottom to top to those from bottom to top in Fig. 1. The standard-model scale-factor (solid curves; Eq. (48)) are indistinguishable following virialisation of the overdense domain, since by assumption, the expanding domain suddenly switchesfrom hyperbolic (super-EdS) evolution to very-nearly flat (EdS) evolution () when virialisation of the overdense domain occurs. A tiny difference from perfectly flat EdS evolution is present because the overdense domain has a small but non-zero fixed (stable clustering) volume.