Figure 3

We plot real parts of K₃ and K₄ at zero temperature for three different values of s = 0.5, s = 1, s = 3 corresponding to sub-Ohmic, Ohmic and super-Ohmic environments with γ = 0.05.

For each environment, we consider three different cutoff frequencies Λ = ω₀/3, Λ = ω₀ and Λ = 30ω₀.