Survival of one dimensional renewal contact process

Abstract

The renewal contact process, introduced in $2019$ by Fontes, Marchetti, Mountford, and Vares, extends the Harris contact process in $\mathbb{Z}^d$ by allowing the possible cure times to be determined according to independent renewal processes (with some interarrival distribution $\mu$) and keeping the transmission times determined according to independent exponential times with a fixed rate $\lambda$. We investigate sufficient conditions on $\mu$ to have a process with a finite critical value $\lambda_c$ for any spatial dimension $d \geq 1$. In particular, we show that $\lambda_c$ is finite when $\mu$ is continuous with bounded support or when $\mu$ is absolutely continuous and has a decreasing hazard rate.