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Contact process on interchange process

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abstract

We introduce a model of epidemics among moving particles on any locally finite graph. At any time, each vertex is empty, occupied by a healthy particle, or occupied by an infected particle. Infected particles recover at rate $1$ and transmit the infection to healthy particles at neighboring vertices at rate $\lambda$. In addition, particles perform an interchange process with rate $\mathsf{v}$, that is, the states of adjacent vertices are swapped independently at rate $\mathsf{v}$, allowing the infection to spread also through the movement of infected particles. On $\mathbb{Z}^d$, we start with a single infected particle at the origin and with all the other vertices independently occupied by a healthy particle with probability $p$ or empty with probability $1-p$. We define $\lambda_c(\mathsf{v}, p)$ as the threshold value for $\lambda$ above which the infection persists with positive probability and analyze its asymptotic behavior as $\mathsf{v} \to \infty$ for fixed $p$.

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math.PR 1

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2026 1

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representative citing papers

Epidemic Phase Transitions in the Zero-Range Process

math.PR · 2026-07-24 · conditional · novelty 7.0

For an epidemic on a zero-range process, the authors prove a non-trivial critical density for extinction versus survival at every healing rate, and a critical healing threshold at low densities.

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  • Epidemic Phase Transitions in the Zero-Range Process math.PR · 2026-07-24 · conditional · none · ref 20 · internal anchor

    For an epidemic on a zero-range process, the authors prove a non-trivial critical density for extinction versus survival at every healing rate, and a critical healing threshold at low densities.