Marco Lenci
Aperiodic Lorentz gas: recurrence and ergodicity
(87K, LaTeX 2e with 3 eps figures)

ABSTRACT.  We prove that any generic (i.e., possibly aperiodic) Lorenz gas in two dimensions, with finite horizon and non-degenerate geometrical features, is ergodic if it is recurrent. We also give examples of aperiodic recurrent gases.