Conjecture on kinetic equations for scale-invariant potentials

Let Φ\Phi be a scale-invariant potential of the form

Φ(x)=1xs,s>12,\Phi(x)=\frac{1}{|x|^s},\qquad s>\frac12,

and consider the scaling

Φε(x)=εΦ(x),N=εγ,\Phi_{\varepsilon}(x)=\varepsilon\Phi(x),\qquad N=\varepsilon^{-\gamma},

with γ>0\gamma>0. Scale-invariant potentials conjecture. If s(12,1)s\in(\frac12,1), then the one-particle marginal f1εf^\varepsilon_1 converges to a solution of a kinetic equation when

γ=41+s,\gamma=\frac{4}{1+s},

and the limiting equation is the Balescu–Lenard equation. If s=1s=1, then on the logarithmic time scale tˉ=logεt\bar t=|\log\varepsilon|t, f1εf^\varepsilon_1 converges to a solution of the Landau equation. If s>1s>1, then a kinetic limit is obtained when

γ=2s,\gamma=\frac{2}{s},

and the limiting equation is the Boltzmann equation. These cases propose the kinetic limits for the three regimes of the scale-invariant interaction, but the source does not specify which assertions have been proved.

Sources & referencesView supporting material

Primary source

Alessia Nota, Juan J. L. Velázquez and Raphael Winter, “Interacting particle systems with long-range interactions: scaling limits and kinetic equations”, arXiv:2003.11605 (2020).

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