Ergodic Properties of an Infinite System of Particles Moving Independently in a Periodic Field*
نویسندگان
چکیده
We investigate the ergodic properties of a general class of infinite systems of independent particles which undergo nontrivial "collisions" with an external field, e.g. fixed convex barriers (the Lorentz gas). We relate the ergodic properties of these systems to the ergodic properties for a single particle moving in a finite box (with periodic boundary conditions) with the same dynamics. We prove that when the one particle system is mixing or a K-system for a sequence of boxes approaching infinity so is the infinite particle system with an equilibrium measure obtained as a Poisson construction over the one particle phase space.
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