Local convergence under conditioning of large maximal degree

Let XX be the canonical process under the excursion measure N\mathbf{N} of the strong Markov process XIX-I at zero. Write HH for the height process, ζ\zeta for its lifetime, and ΔX\Delta X for the jumps of XX. Let H\overleftarrow{H}' and H\overrightarrow{H}' denote the height processes defining the continuum condensation tree. Assume that α>0\alpha>0 and that the Lévy measure π\pi has unbounded support. The local convergence conjecture. As rr\rightarrow\infty,

(Htζ,H(ζt)+;t0) under N[supΔX>r](Ht,Ht;t0)(H_{t\wedge \zeta},H_{(\zeta-t)_+};t\geq 0) \text{ under }\mathbf{N}[\cdot\mid\sup \Delta X >r]\longrightarrow (\overleftarrow{H}'_t,\overrightarrow{H}'_t;t\geq 0)

weakly in C([0,),R2)\mathbb{C}([0,\infty),\mathbb{R}^2). This is the expected local limit of subcritical Lévy trees conditioned to have large maximal degree, analogous to known local-convergence results for Galton–Watson trees conditioned on large maximal out-degree and continuous-state branching processes conditioned on a large maximal jump; the proof is not currently available.

Sources & referencesView supporting material

Primary source

Xin He, “Local convergence of critical random trees and continuous-state branching processes”, arXiv:1503.00951 (2015).

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