Fluctuation dissipation ratio in the one-dimensional kinetic ising model
The exact relation between the response function R(t,t(')) and the two time correlation function C(t,t(')) is derived analytically in the one-dimensional kinetic Ising model subjected to a temperature quench. The fluctuation dissipation ratio X(t,t(')) is found to depend on time through C(t,t(')) in the time region where scaling C(t,t('))=f(t/t(')) holds. The crossover from the nontrivial form X[C(t,t('))] to X(t,t(')) identical with1 takes place as the waiting time t(w) is increased from below to above the equilibration time t(eq).
Lippiello
E
Istituto Nazionale di Fisica della Materia, Unita di Salerno and Dipartimento di Fisica, Universita di Salerno, 84081 Baronissi, Salerno, Italy.
Zannetti
M