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From snapping out Brownian motions to Walsh's spider processes on star-like graphs

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arxiv 2406.16800 v1 pith:HNXZJJ5P submitted 2024-06-24 math.PR

classification math.PR
keywords browniangraphmotionprocessspiderstar-likewalshanalyzing
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abstract

By analyzing matrices involved, we prove that a snapping-out Brownian motion with large permeability coefficients is a good approximation of Walsh's spider process on the star-like graph $K_{1,k}$. Thus, the latter process can be seen as a Brownian motion perturbed by a trace of semi-permeable membrane at the graph's center.

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  1. General diffusions on metric graphs as limits of time-space Markov Chains

    math.PR 2025-07 conditional novelty 7.0 of 10

    A new space-time Markov chain approximation for general diffusions on metric graphs is shown to converge in p-Wasserstein distance at explicit rates governed by a thinness quantifier of the subdivision.

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