title: On-lattice coalescence and annihilation of immobile reactants in loopless lattices and beyond.
abstract: We study the behavior of the chemical reactions A+A-->A+S and A+A-->S+S (where the reactive species A and the inert species S are both assumed to be immobile) embedded on Bethe lattices of arbitrary coordination number z and on a two-dimensional (2D) square lattice. For the Bethe lattice case, exact solutions for the coverage in the A species in terms of the initial condition are obtained. In particular, our results hold for the important case of an infinite one-dimensional (1D) lattice (z=2). The method is based on an expansion in terms of conditional probabilities which exploits a Markovian property of these systems. Along the same lines, an approximate solution for the case of a 2D square lattice is developed. The effect of dilution in a random initial condition is discussed in detail, both for the lattice coverage and for the spatial distribution of reactants.
authors.affiliation: Centre for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, CP 231, 1050 Bruxelles, Belgium. eabad@ulb.ac.be
authors.forename: E
authors.initials: E
authors.lastname: Abad