Continuously varying exponents in $A+B \to 0$ reaction with long-ranged attractive interaction

Details Continuously varying exponents in $A+B \to 0$ reaction with long-ranged attractive interaction Continuously varying exponents in $A+B \to 0$ reaction with long-ranged attractive interaction

2006-03-20

arxiv.org/abs/cond-mat/0603493v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevE.74.021109

We investigate the kinetics of the $A+B \to 0$ reaction with long-range attractive interaction $V(r) \sim -r^{-2\sigma}$ between $A$ and $B$ or with the drift velocity $v \sim r^{-\sigma}$ in one dimension, where $r$ is the closest distance between $A$ and $B$. It is analytically show that the dynamical exponents for density of particles ($\rho$) and the size of domains ($\ell$) continuously vary with $\sigma$ when $\sigma < \sigma_c =/1/2$, while that for the distance between adjacent opposite species ($\ell_{AB}$) varies when $\sigma < \sigma_c^{AB}= 7/6$. Beyond $\sigma_c^{AB}$, diffusive motions dominate the kinetics, so that the dynamical behavior for diffusive systems is completely recovered. These anomalous behaviors with the two crossover values of $\sigma$ are supported by numerical simulations and the argument of effective repulsion between the opposite species domains.

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