Large Deviations in the Free-Energy of Mean-Field Spin-Glasses

Giorgio Parisi, Tommaso Rizzo

Published 2007-06-08, updated 2007-06-20Version 2

We compute analytically the probability distribution of large deviations in the spin-glass free energy for the Sherrington-Kirkpatrick mean field model, i.e. we compute the exponentially small probability of finding a system with intensive free energy smaller than the most likely one. This result is obtained by computing the average value of the partition function to the power $n$ as a function of $n$. At zero temperature this absolute prediction displays a remarkable quantitative agreement with the numerical data.