For scaled Brownian motion, Riemann-Liouville fractional Brownian motion, and fractional Brownian motion, the fastest first passage time decays logarithmically with searcher number and subdiffusion can be faster than normal diffusion, though exact regimes are model-dependent.
Mean first passage times of higher-dimensional velocity jump processes
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abstract
First passage phenomena arise across physics, biology, and finance when stochastic processes first reach a threshold, triggering downstream events. Examples include the irreversible exit from a domain, a biochemical reaction, a financial selloff. While typical formulations involve diffusive motion, many stochastic processes are better described as velocity jump processes, characterized by persistent motion interrupted by stochastic velocity changes. Despite their ubiquity, first-passage properties of velocity jump processes remain underdeveloped in higher dimensions, especially under directional bias. We present a general framework to estimate the mean first passage time (MFPT) and higher moments of the survival probability for fixed-speed velocity jump processes where possible reorientations range from strong alignment to full angular anisotropy. For low Knudsen numbers, when the mean free path is small compared to the distance to the target, we derive a universal form for the MFPT in which two bias functions encode broad classes of angular distributions, including von Mises-Fisher, wrapped Cauchy, and elliptical families. In the narrow capture limit of a vanishingly small target, directional persistence induces anomalous scaling, including regimes where the MFPT remains finite whereas standard diffusion would predict divergence. Finally, we obtain a Langevin representation that accurately reproduces first-passage statistics. Analytical predictions are confirmed by numerical simulations.
fields
cond-mat.stat-mech 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
citing papers explorer
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Universality and ambiguity in extremes of anomalous diffusion
For scaled Brownian motion, Riemann-Liouville fractional Brownian motion, and fractional Brownian motion, the fastest first passage time decays logarithmically with searcher number and subdiffusion can be faster than normal diffusion, though exact regimes are model-dependent.