def kramersRate (ℓ ω₀ ω_b ΔΦ T : ℝ) : ℝ := ℓ * ω₀ * ω_b / (2 * Real.pi) * Real.exp (-ΔΦ / T)
thesis/CESProofs/Dynamics/GibbsMeasure.lean:314
### Kramers Escape Rate