Figure 4

Figure 4: The evolution of the dimensionless shear parameter Ωshear = σ2 ∕6H2 on a Bianchi I brane, for a V = 12m2 ϕ2 model. The early and late-time expansion of the universe is isotropic, but the shear dominates during an intermediate anisotropic stage. (Figure taken from [307].)