Non-equilibrium dynamics of spin glasses.

We consider the non-equilibrium behavior of the spin glass ordered phase within the droplet scaling theory introduced previously. The fundamental long time nonequilibrium process is assumed to be thermally activated growth of spin-glass ordered domains. The remanent magnetization, m(t), in zero field is found to decay at long times as m(t)~ R sup -lambda, where R sub t ~(ent) sup 1/psi is the linear domain size, psi is previously introduced barrier exponent describing the growth activation barrier height with length scale, and lambda is a new non-equilibrium dynamic exponent, satisfying lambda > d/2 for d-dimensional systems.