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.
Pr¨ uferet al., Observation of universal dynamics in a spinor Bose gas far from equilibrium, Nature563, 217 (2018)
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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.