Informal stable-CSBP and genealogy convergence conjecture for spatial branching processes

Let h~\tinfty\tilde h^\tinfty denote the invariant spatial distribution of particles, and suppose that, for some slowly varying function \ell and α\backslashin(1,2)\alpha\backslashin(1,2), condition

h~(h1(x,))(y)yα\tilde h_{\infty}( h_{\infty}^{-1} (x,\infty)) \sim \frac{\ell(y)}{y^\alpha}

holds as yy\to\infty. Stable-CSBP and genealogy conjecture. Assume that this condition holds. Then the process describing the total number of particles and the genealogy at a given time become indistinguishable from an α\alpha-stable CSBP and its genealogical structure. Further, the particles are asymptotically distributed as independent identically distributed random variables with distribution h~\tilde h^\infty. This is an informal heuristic for the joint scaling limit of the population and genealogy; the statement is presented without a precise topology or a resolution status in the source.

Sources & referencesView supporting material

Primary source

Félix Foutel-Rodier, Emmanuel Schertzer and Julie Tourniaire, “Convergence of spatial branching processes to α-stable CSBPs: Genealogy of semi-pushed fronts”, arXiv:2402.05096 (2026).

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