title: Khinchin theorem and anomalous diffusion.
abstract: A recent Letter [M. H. Lee, Phys. Rev. Lett. 98, 190601 (2007)] has called attention to the fact that irreversibility is a broader concept than ergodicity, and that therefore the Khinchin theorem [A. I. Khinchin, (Dover, New York, 1949)] may fail in some systems. In this Letter we show that for all ranges of normal and anomalous diffusion described by a generalized Langevin equation the Khinchin theorem holds.
authors.affiliation: Instituto de Física, Universidade de Brasília, Caixa Postal 04513, 70919-970 Brasília, Distrito Federal, Brazil.
authors.forename: Luciano C
authors.initials: LC
authors.lastname: Lapas
authors.forename: Rafael
authors.initials: R
authors.lastname: Morgado
authors.forename: Mendeli H
authors.initials: MH
authors.lastname: Vainstein
authors.forename: J Miguel
authors.initials: JM
authors.lastname: Rubí
authors.forename: Fernando A
authors.initials: FA
authors.lastname: Oliveira