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.
From the Dyson equation for the retarded response function, χR ϕϕ(k, ω) −1 = χR ϕϕ,0(k, ω) −1 −Σ R ϕϕ(k, ω),(B1) whereχ R ϕϕ,0 is the bare response
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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.