Fab Four: When John and George Play Gravitation and Cosmology

Figure 3

Plot of the six conditions 𝑄_𝑖 and 𝑐_𝑖 derived previously, as a function 𝑥. Here 𝛾=−1. Allowed values for the field velocity are typically |𝑥|<𝒪(|𝛾|^−1/2).