Abstract
In the Sherrington-Kirkpatrick mean field model for spin glasses, we show that the quenched average of the free energy can be expressed through a couple of functional order parameters, in a form very similar to the one found in the frame of the replica symmetry breaking method. The functional order parameters are implicitely given in terms of fluctuations of thermodynamic variables. Under the assumption that the two order parameters can be chosen to be the same, in the thermodynamic limit, it is shown that the Parisi free energy is a rigorous upper bound for the free energy of the model.
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