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Violation of the fluctuation dissipation theorem during domain growth in the long-range Ising model
Parbati Saha1, Sanjay Puri2, Varsha Banerjee1
1Indian Institute of Technology Delhi, Department of Physics, New Delhi 110016, India.
Abstract:
The celebrated fluctuation dissipation theorem (FDT) does not apply to nonequilibrium systems. In this context, Cugliandolo and Kurchan [Phys. Rev. Lett. 71, 173 (1993)10.1103/PhysRevLett.71.173] introduced a generalized FDT which interprets the nonequilibrium evolution as a composition of time sectors corresponding to different effective temperatures. We use this framework to study domain growth in the d=2 long-range Ising model with nonconserved kinetics (Glauber spin flip) and conserved kinetics (Kawasaki spin exchange). We study the dynamical scaling and superuniversal scaling of various two-time quantities, e.g., autocorrelation function, response function, effective temperature, etc. In particular, we investigate how the interaction range and conservation laws affect these characteristic features of domain growth.
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