J. Kurchan coauthored a 1993 analytical study of relaxation in a long-range spin glass with Leticia Fernanda Cugliandolo. They solved the long-time behaviour of correlation and response functions in a spherical model with interactions involving several spins.[ref]
The solution exhibits aging in nonequilibrium systems: the response after a disturbance depends on how long the system has already been evolving, rather than only on elapsed time since the disturbance. It supplies an explicit model in which slow history-dependent dynamics can be studied analytically. The initials are those printed in the primary-paper byline.
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