The relation between the autocorrelation C (t, t(w)) and the integrated linear response function chi(t, t(w)) is studied in the context of the large-N model for phase-ordering systems subjected to a shear flow. In the high-temperature phase T> T-c a non-equilibrium stationary state is entered which is characterized by a non-trivial fluctuation-dissipation relation chi(t- t(w)) = (χ) over tilde (C (t-t(w))). For quenches below T-c the splitting of the order parameter field into two statistically independent components, responsible for the stationary C-st (t-t(w)) and aging C-ag (t/t(w)) part of the autocorrelation function, can be explicitly exhibited in close analogy with the undriven case. In the regime t-t(w) << t(w) the same relation chi(t-t(w)) = (χ) over tilde (C-st (t-t(w))) is found between the response and C-st (t-t(w)), as for T> T-c. The aging part of chi(t, t(w)) is negligible for t(w) --> infinity, as without drive, resulting in a at chi(C) in the aging regime t-t(w) >> t(w).

Effects of an external drive on the fluctuation-dissipation relation of phase-ordering systems

CORBERI, Federico;ZANNETTI, Marco
2002

Abstract

The relation between the autocorrelation C (t, t(w)) and the integrated linear response function chi(t, t(w)) is studied in the context of the large-N model for phase-ordering systems subjected to a shear flow. In the high-temperature phase T> T-c a non-equilibrium stationary state is entered which is characterized by a non-trivial fluctuation-dissipation relation chi(t- t(w)) = (χ) over tilde (C (t-t(w))). For quenches below T-c the splitting of the order parameter field into two statistically independent components, responsible for the stationary C-st (t-t(w)) and aging C-ag (t/t(w)) part of the autocorrelation function, can be explicitly exhibited in close analogy with the undriven case. In the regime t-t(w) << t(w) the same relation chi(t-t(w)) = (χ) over tilde (C-st (t-t(w))) is found between the response and C-st (t-t(w)), as for T> T-c. The aging part of chi(t, t(w)) is negligible for t(w) --> infinity, as without drive, resulting in a at chi(C) in the aging regime t-t(w) >> t(w).
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3136976
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 4
social impact