Figure 6
From: Period doubling induced by thermal noise amplification in genetic circuits
Comparison between theory and numerical simulations.
Panel (a) compares the normalized subharmonic current power density 
(circle markers) versus analytic theory (solid line) for different normalized frequencies Ω = ωp/2ω0. In the numerical simulations we choose V0 = 2 V, T = 10−7 W and change the input frequency in the range ωp ∈ [ω0/2, 2ω0]. For each ωp we averaged over 40 simulations to guarantee convergence of the mean value and standard deviation. Panel (b) shows the behavior of the normalized power density spectrum in the surroundings of the input frequency ωp (solid red line) and near the subharmonic peak at ωp/2 (solid green line). Spectra are calculated for a single numerical simulation with V0 = 2 V, T = 10−7 W and ωp/ω0 = 1.4.
