Résumé
A detailed numerical study is made of relaxation at equilibrium in the Sherrington-Kirkpatrick Ising spin glass (ISG) model, at and above the critical temperature T-g. The data show a long time stretched exponential relaxation q(t) similar to exp{-[t/tau(T)](beta(T))} with an exponent beta(T) tending to approximate to 1/3 at T-g. The results are compared to those which were observed by A. T. Ogielski, [Phys. Rev. B 32, 7384 (1985)] in the three-dimensional ISG model and are discussed in terms of a phase space percolation transition scenario.