Caldeira–Leggett classical damping: η = π·J_c²·ρ/2; FD theorem ⟨f(t)f(t')⟩ = 2η·kB·T·δ(t−t')

Caldeira–Leggett damping coefficient and fluctuation-dissipation. From framework F7, integrating out the Ohmic bath gives a Langevin equation m·q̈ + η·q̇ + V'(q) = f(t) with damping η = π·J_c²·ρ(ω₀)/2 set by the bath spectral density at…