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    Diffusive geodesics wandering in networks of rigid chains

    Ulysse Marquis*

    • *Contact author: umarquis@fbk.eu

    Phys. Rev. E 112, 064316 – Published 24 December, 2025

    DOI: https://doi.org/10.1103/d6y6-j48y

    Abstract

    We introduce an ensemble of spatial networks built from the junctions of hindered-rotation chains, incorporating directional correlations between bonds, an aspect ignored in the standard network modeling paradigm. The emergent random networks support geodesics with a wandering exponent ξ=1/2, and a travel-time fluctuation exponent χ=0, consistent with the KPZ relation, yet violating the bound χ≥1/8 predicted in the Poissonian framework. Transverse deviations follow the Kolmogorov distribution, indicating similarities between Brownian bridge excursions and geodesics in a random medium with correlated edges orientations. These results reveal a new universality class of Euclidean first-passage percolation, where local orientational memory reshapes transport properties and challenges existing bounds for random spatial networks.

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