Reaction-diffusion with a time-dependent reaction rate: the single-species diffusion-annihilation process
Abstract
We study the single-species diffusion-annihilation process with a time-dependent reaction rate, lambda(t)=lambda_0 t^-omega. Scaling arguments show that there is a critical value of the decay exponent omega_c(d) separating a reaction-limited regime for omega > omega_c from a diffusion-limited regime for omega < omega_c. The particle density displays a mean-field, omega-dependent, decay when the process is reaction limited whereas it behaves as for a constant reaction rate when the process is diffusion limited. These results are confirmed by Monte Carlo simulations. They allow us to discuss the scaling behaviour of coupled diffusion-annihilation processes in terms of effective time-dependent reaction rates.
Cite
@article{arxiv.cond-mat/0407154,
title = {Reaction-diffusion with a time-dependent reaction rate: the single-species diffusion-annihilation process},
author = {L. Turban},
journal= {arXiv preprint arXiv:cond-mat/0407154},
year = {2007}
}
Comments
11 pages, 9 figures, minor corrections