title: Separation of time scales and reparametrization invariance for aging systems.
abstract: We show that the generating functional describing the slow dynamics of spin-glass systems is invariant under reparametrizations of the time. This result is general and applies for both infinite and short-range models. It follows simply from the assumption that a separation between short time scales and long time scales exists in the system, and from the constraints of causality and unitarity. Global-time reparametrization invariance suggests that the low action excitations in a spin-glass may be smoothly spatially varying time reparametrizations. These Goldstone modes may provide the basis for an analytic dynamical theory of short-range spin glasses.
authors.affiliation: Department of Physics, Boston University, Boston, Massachusetts 02215, USA.
authors.forename: Claudio
authors.initials: C
authors.lastname: Chamon
authors.forename: Malcolm P
authors.initials: MP
authors.lastname: Kennett
authors.forename: Horacio E
authors.initials: HE
authors.lastname: Castillo
authors.forename: Leticia F
authors.initials: LF
authors.lastname: Cugliandolo