Local limit conjecture for conditioned sub-critical non-generic marked Galton–Watson trees

From papers

Let τ\tau^{*} be a sub-critical and non-generic marked Galton–Watson tree with offspring distribution p\mathbf{p} satisfying the condition in

, with $\rho_l(\mathbf{p},\mathbf{q})=1$, and mark function $\mathbf{q}$ satisfying the condition in

. Let M(τ)M(\tau^*) denote the total mark and let τC(p,q)\tau_C^{*}(\mathbf{p},\mathbf{q}) be the corresponding condensation-tree limit. Local limit conjecture. The conditioned tree converges in distribution as the total mark tends to infinity:

dist(τM(τ)=n)n+dist(τC(p,q)).\mathrm{dist}(\tau^{*}\mid M(\tau^*)=n)\underset{n\to+\infty}{\longrightarrow} \mathrm{dist}(\tau_C^{*}(\mathbf{p},\mathbf{q})).

The conjecture proposes the local limit in the sub-critical, non-generic case not covered by the paper's results. Its validity is left open in the supplied text.

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Sources & referencesView supporting material

Primary source

Romain Abraham, Sonia Boulal and Pierre Debs, “Local limits of conditioned marked Galton Watson trees”, arXiv:2509.18804 (2025).

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