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

Abstract

We investigate the kinetics of the $A+B \to 0$ reaction with long-range attractive interaction $V(r) \sim -r^{-2σ}$ between $A$ and $B$ or with the drift velocity $v \sim r^{-σ}$ 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 ($ρ$) and the size of domains ($\ell$) continuously vary with $σ$ when $σ< σ_c =/1/2$, while that for the distance between adjacent opposite species ($\ell_{AB}$) varies when $σ< σ_c^{AB}= 7/6$. Beyond $σ_c^{AB}$, 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 $σ$ are supported by numerical simulations and the argument of effective repulsion between the opposite species domains.