Symmetry-enforced diffusive Langevin dynamics plus decoherence of high-momentum modes produces a universal momentum distribution that yields the parameter-free prediction C=3 for the coherence spreading constant ℓ²(t) = C ħ t / m.
To fix the numerical coefficient, we adopt the standard Gaussian white noise approximation for the stochastic current, which yields a tractable Langevin equation
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Universal Speed Limit in a Far-from-Equilibrium Bose Gas: Symmetry and Dynamical Decoherence
Symmetry-enforced diffusive Langevin dynamics plus decoherence of high-momentum modes produces a universal momentum distribution that yields the parameter-free prediction C=3 for the coherence spreading constant ℓ²(t) = C ħ t / m.