Stationary fixed-point conjecture for the Rath–Toth forest fire equations

Let vkn(t)v_k^n(t) be the random proportion of vertices at time tt that belong to clusters of size kk under the stationary law Pstatn\mathbb{P}_{\mathrm{stat}}^n, and let (wk)k=1(w_k)_{k=1}^{\infty} be the fixed-point solution of the critical forest fire equations. Stationary fixed-point conjecture. For every ϵ>0\epsilon>0 and T>0T>0,

Pstatn(supt[0,T]supk1vkn(t)wk>ϵ)0as n.\mathbb{P}_{\mathrm{stat}}^n\left(\sup_{t\in[0,T]}\sup_{k\geq 1}\left|v_k^n(t)-w_k\right|>\epsilon\right)\to 0\qquad\text{as }n\to\infty.

This asserts uniform-in-time and uniform-in-cluster-size convergence in probability of the stationary states to the critical fixed point. The source states that this convergence is not known and that existing results do not apply because the fixed point fails the required third-moment condition.

Sources & referencesView supporting material

Primary source

Edward Crane, “Steady state clusters and the Rath-Toth mean field forest fire model”, arXiv:1809.03462 (2018).

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