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In this paper, we prove the phase mixing estimates for the density and its derivatives associated with the nonlinear Hartree equation around certain translation-invariant equilibria. Their decay rates are exactly the same as those of free Hartree dynamics. Our method is based on pointwise decay estimates of the Green function associated with the linearized operator in Fourier space and a nonlinear iterative scheme. Another proof of short-range scattering, established in arXiv:1310.0604, arXiv:1607.07958, arXiv:2308.15929, is also provided.
Chanjin You (Wed,) studied this question.