A stroll among effective temperatures in aging systems: limits and perspectives
arXiv:0810.1405 · doi:10.1016/j.jnoncrysol.2009.01.035
Abstract
In this paper we present a short survey on the concept of effective temperature, on its onset as a glass former vitrifies, on the various definitions in literature and their limits of applicability. An exactly solvable model glass is employed to compare effective temperatures among them and to set a criterion for the occurrence of a universal extra temperature in the framework of a "two temperature thermodynamics" for off-equilibrium aging systems. It will be shown that aging in glass formers is not a sufficient requirement. As an instance, memory effects typical of glasses are not compatible with a unique effective temperature. Yet, a reduced range of applicability can still be established and investigated.
9 pages, 5 figures, contribution to the "Glass and Entropy" special volume of J. Non-Cryst. Solids
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