Published online by Cambridge University Press: 16 September 2021
The logistic birth and death process is perhaps the simplest stochastic population model that has both density-dependent reproduction and a phase transition, and a lot can be learned about the process by studying its extinction time, $\tau_n$, as a function of system size n. A number of existing results describe the scaling of
$\tau_n$ as
$n\to\infty$ for various choices of reproductive rate
$r_n$ and initial population
$X_n(0)$ as a function of n. We collect and complete this picture, obtaining a complete classification of all sequences
$(r_n)$ and
$(X_n(0))$ for which there exist rescaling parameters
$(s_n)$ and
$(t_n)$ such that
$(\tau_n-t_n)/s_n$ converges in distribution as
$n\to\infty$, and identifying the limits in each case.