Energy Conditions in a Generalized Second-Order Scalar-Tensor Gravity

Figure 4

Plots (a) and (b) show WEC, namely, 𝜌^eff≥0 and 𝜌^eff+𝑝^eff≥0 versus parameters 𝑛 and 𝛽.

(a) 𝜌^eff≥0

(b) 𝜌^eff+𝑝^eff≥0