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

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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(τ∗∣M(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.

References

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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