Aging in ferromagnetic systems at criticality near four dimensions

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We study the off-equilibrium response and correlation functions and the corresponding fluctuation-dissipation ratio for a purely dissipative relaxation of an O(N) symmetric vector model (Model A) below its upper critical dimension. The scaling behavior of these quantities is analyzed and the associated universal functions are determined at first order in epsilon expansion in the high-temperature phase and at criticality. A non trivial limit of the fluctuation-dissipation ratio is found in the aging regime.
11 pages, 1 figure

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Statistical Mechanics, High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/211858

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0203096
 http://arxiv.org/abs/cond-mat/0203096
 Phys.Rev.E65:066120,2002
 doi:10.1103/PhysRevE.65.066120

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