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EnglishWithin the universality class of ferromagnetic vector models with O(n) symmetry and purely dissipative dynamics, we study the non-equilibrium critical relaxation from a magnetized initial state. Transverse correlation and response functions are exactly computed for Gaussian fluctuations and in the limit of infinite number n of components of the order parameter. We find that the fluctuation-dissipation ratios (FDRs) for longitudinal and transverse modes differ already at the Gaussian level. In these two exactly solvable cases we completely describe the crossover from the short-time to the long-time behaviour, corresponding to a disordered and a magnetized initial condition, respectively. The effects of non-Gaussian fluctuations on longitudinal and transverse quantities are calculated in the first order in the epsilon-expansion (epsilon = 4-d) and reliable three-dimensional estimates of the two FDRs are obtained.
| Autori interni: | |
| Autori: | Calabrese P; Gambassi A |
| Titolo: | Slow dynamics in critical ferromagnetic vector models relaxing from a magnetized initial state |
| Anno del prodotto: | 2007 |
| Digital Object Identifier (DOI): | 10.1088/1742-5468/2007/01/P01001 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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