title: Comment on "Generalized exclusion processes: Transport coefficients".
abstract: In a recent paper, Arita et al. [Phys. Rev. E 90, 052108 (2014)PLEEE81539-375510.1103/PhysRevE.90.052108] consider the transport properties of a class of generalized exclusion processes. Analytical expressions for the transport-diffusion coefficient are derived by ignoring correlations. It is claimed that these expressions become exact in the hydrodynamic limit. In this Comment, we point out that (i) the influence of correlations upon the diffusion does not vanish in the hydrodynamic limit, and (ii) the expressions for the self- and transport diffusion derived by Arita et al. are special cases of results derived in Becker et al. [Phys. Rev. Lett. 111, 110601 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.110601].
authors.affiliation: Hasselt University, B-3590 Diepenbeek, Belgium.
authors.forename: T
authors.initials: T
authors.lastname: Becker
authors.affiliation: Hasselt University, B-3590 Diepenbeek, Belgium.|Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
authors.forename: K
authors.initials: K
authors.lastname: Nelissen
authors.affiliation: Hasselt University, B-3590 Diepenbeek, Belgium.
authors.forename: B
authors.initials: B
authors.lastname: Cleuren
authors.affiliation: Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
authors.forename: B
authors.initials: B
authors.lastname: Partoens
authors.affiliation: Hasselt University, B-3590 Diepenbeek, Belgium.
authors.forename: C
authors.initials: C
authors.lastname: Van den Broeck