title: Kac-potential treatment of nonintegrable interactions.
abstract: We consider d-dimensional systems with nonintegrable, algebraically decaying pairwise interactions. It is shown that, upon the introduction of periodic boundary conditions and a long-distance cutoff in the interaction range, the bulk thermodynamics can be obtained rigorously by means of a Kac-potential treatment, leading to an exact, mean-field-like theory. This explains various numerical results recently obtained for finite systems in the context of "nonextensive thermodynamics," and in passing exposes a strong regulator dependence not discussed in these studies. Our findings imply that, contrary to some claims, Boltzmann-Gibbs statistics are sufficient for a standard description of this class of nonintegrable interactions.
authors: Department of Physics, Bucknell University, Lewisburg, Pennsylvania 17837, USA.
authors: B P
authors: BP
authors: Vollmayr-Lee
authors: E
authors: E
authors: Luijten