Effects of an external drive on the fluctuation-dissipation relation of phase-ordering systems
INFM, Unità di Salerno and Dipartimento di Fisica,
Università di Salerno 84081 Baronissi (SA), Italy
2 INFM and Dipartimento di Fisica, Università di Bari and INFN, Sezione di Bari via Amendola 173, 70126 Bari, Italy
Accepted: 9 August 2002
The relation between the autocorrelation and the integrated linear response function is studied in the context of the large-N model for phase-ordering systems subjected to a shear flow. In the high-temperature phase a non-equilibrium stationary state is entered which is characterized by a non-trivial fluctuation-dissipation relation . For quenches below the splitting of the order parameter field into two statistically independent components, responsible for the stationary and aging part of the autocorrelation function, can be explicitly exhibited in close analogy with the undriven case. In the regime the same relation is found between the response and , as for . The aging part of is negligible for , as without drive, resulting in a flat in the aging regime .
PACS: 64.75.+g – Solubility, segregation, and mixing; phase separation / 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 83.50.Ax – Steady shear flows, viscometric flow
© EDP Sciences, 2002