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The violations of the fluctuation-dissipation theorem are analyzed for a trapmodel with a gausssian density of states. In this model, the system reachesthermal equilibrium for long times after a quench to any finite temperature andtherefore all aging effect are of a transient nature. For not too long timesafter the quench it is found that the so-called fluctuation-dissipation ratiotends to a non-trivial limit, thus inicating the possibility for the definitionof a time scale dependent effective temperature. However, different definitionsof the effective temperature yield distinct results. In particular plots of theintegrated response versus the correlation function strongly depend on the waythey are constructed. Also the definition of effective temperatures in thefrequency domain is not unique for the model considered. This may have someimplications for the interpretation of results from computer simulations andexperimental determinations of effective temperatures.Comment: Proceedings of the workshop on non-equilibrium phenomena in  supercooled fluids, glasses and amorphous materials (17-22 September, Pisa

Out-of-equilibrium dynamics in a Gaussian trap model