We study the four-dimensional Gaussian spin glass in presence of a magnetic field. Using off-equilibrium numerical simulations we have found that the probability distribution of the overlaps is built in the same way as that of the mean-field approximation with replica symmetry breaking. Finally, we have studied the violation of the fluctuation-dissipation theorem in presence of a magnetic field.

• Received 21 November 1997

DOI:https://doi.org/10.1103/PhysRevB.57.13617