title: Comment on "Scaling of the linear response in simple aging systems without disorder".
abstract: We have repeated the simulations of Henkel, Paessens, and Pleimling (HPP) [Phys. Rev. E 69, 056109 (2004)] for the field-cooled susceptibility chi(FC)(t) - chi0 approximately t(-A) in the quench of ferromagnetic systems to and below T(C). We show that, contrary to the statement made by HPP, the exponent A coincides with the exponent a of the linear response function R(t,s) approximately s(-(1+a))f(R)(t/s). We point out what are the assumptions in the argument of HPP that lead them to the conclusion A < a.
authors.affiliation: Istituto Nazionale di Fisica della Materia, Unità di Salerno and Dipartimento di Fisica E.R. Caianiello, Università di Salerno, 84081 Baronissi (Salerno), Italy. corberi@sa.infn.it
authors.forename: Federico
authors.initials: F
authors.lastname: Corberi
authors.forename: Eugenio
authors.initials: E
authors.lastname: Lippiello
authors.forename: Marco
authors.initials: M
authors.lastname: Zannetti