Cosmography and Large Scale Structure by 𝑓(𝑅)-Gravity: New Results

Figure 3

The dimensionless ratio between the present day values of 𝑓^′′(𝑅) and 𝑓(𝑅) as function of the 𝑤_𝑎 parameter for models with 𝑤₀=−1. Short dashed and solid lines refer to models with Ω_𝑀=0.041 and 0.250, respectively.